diff --git a/Admin/Installer.php b/Admin/Installer.php
index 55a31b0..d6f8485 100644
--- a/Admin/Installer.php
+++ b/Admin/Installer.php
@@ -15,9 +15,9 @@ declare(strict_types=1);
 namespace Modules\Billing\Admin;
 
 use Modules\Billing\Models\BillType;
-use Modules\Billing\Models\BillTypeMapper;
 use Modules\Billing\Models\BillTypeL11n;
 use Modules\Billing\Models\BillTypeL11nMapper;
+use Modules\Billing\Models\BillTypeMapper;
 use phpOMS\Config\SettingsInterface;
 use phpOMS\DataStorage\Database\DatabasePool;
 use phpOMS\Localization\ISO639x1Enum;
@@ -34,7 +34,7 @@ use phpOMS\Module\ModuleInfo;
  */
 final class Installer extends InstallerAbstract
 {
-	/**
+    /**
      * {@inheritdoc}
      */
     public static function install(DatabasePool $dbPool, ModuleInfo $info, SettingsInterface $cfgHandler) : void
diff --git a/Admin/Routes/Web/Backend.php b/Admin/Routes/Web/Backend.php
index e5c4ab9..cb13ef9 100644
--- a/Admin/Routes/Web/Backend.php
+++ b/Admin/Routes/Web/Backend.php
@@ -8,56 +8,56 @@ use phpOMS\Router\RouteVerb;
 return [
     '^.*/sales/invoice/create.*$' => [
         [
-            'dest' => '\Modules\Billing\Controller\BackendController:viewBillingInvoiceCreate',
-            'verb' => RouteVerb::GET,
+            'dest'       => '\Modules\Billing\Controller\BackendController:viewBillingInvoiceCreate',
+            'verb'       => RouteVerb::GET,
             'permission' => [
                 'module' => BackendController::MODULE_NAME,
-                'type'  => PermissionType::CREATE,
-                'state' => PermissionState::SALES_INVOICE,
+                'type'   => PermissionType::CREATE,
+                'state'  => PermissionState::SALES_INVOICE,
             ],
         ],
     ],
     '^.*/sales/invoice/list.*$' => [
         [
-            'dest' => '\Modules\Billing\Controller\BackendController:viewBillingInvoiceList',
-            'verb' => RouteVerb::GET,
+            'dest'       => '\Modules\Billing\Controller\BackendController:viewBillingInvoiceList',
+            'verb'       => RouteVerb::GET,
             'permission' => [
                 'module' => BackendController::MODULE_NAME,
-                'type'  => PermissionType::READ,
-                'state' => PermissionState::SALES_INVOICE,
+                'type'   => PermissionType::READ,
+                'state'  => PermissionState::SALES_INVOICE,
             ],
         ],
     ],
     '^.*/sales/invoice\?.*$' => [
         [
-            'dest' => '\Modules\Billing\Controller\BackendController:viewBillingInvoice',
-            'verb' => RouteVerb::GET,
+            'dest'       => '\Modules\Billing\Controller\BackendController:viewBillingInvoice',
+            'verb'       => RouteVerb::GET,
             'permission' => [
                 'module' => BackendController::MODULE_NAME,
-                'type'  => PermissionType::READ,
-                'state' => PermissionState::SALES_INVOICE,
+                'type'   => PermissionType::READ,
+                'state'  => PermissionState::SALES_INVOICE,
             ],
         ],
     ],
     '^.*/purchase/invoice/create.*$' => [
         [
-            'dest' => '\Modules\Billing\Controller\BackendController:viewBillingPurchaseInvoiceCreate',
-            'verb' => RouteVerb::GET,
+            'dest'       => '\Modules\Billing\Controller\BackendController:viewBillingPurchaseInvoiceCreate',
+            'verb'       => RouteVerb::GET,
             'permission' => [
                 'module' => BackendController::MODULE_NAME,
-                'type'  => PermissionType::CREATE,
-                'state' => PermissionState::PURCHASE_INVOICE,
+                'type'   => PermissionType::CREATE,
+                'state'  => PermissionState::PURCHASE_INVOICE,
             ],
         ],
     ],
     '^.*/purchase/invoice/list.*$' => [
         [
-            'dest' => '\Modules\Billing\Controller\BackendController:viewBillingPurchaInvoiceList',
-            'verb' => RouteVerb::GET,
+            'dest'       => '\Modules\Billing\Controller\BackendController:viewBillingPurchaInvoiceList',
+            'verb'       => RouteVerb::GET,
             'permission' => [
                 'module' => BackendController::MODULE_NAME,
-                'type'  => PermissionType::READ,
-                'state' => PermissionState::PURCHASE_INVOICE,
+                'type'   => PermissionType::READ,
+                'state'  => PermissionState::PURCHASE_INVOICE,
             ],
         ],
     ],
diff --git a/Controller/ApiController.php b/Controller/ApiController.php
index be8e1e9..0b2a35c 100644
--- a/Controller/ApiController.php
+++ b/Controller/ApiController.php
@@ -16,22 +16,19 @@ namespace Modules\Billing\Controller;
 
 use Modules\Admin\Models\NullAccount;
 use Modules\Billing\Models\Bill;
-use Modules\Billing\Models\BillMapper;
 use Modules\Billing\Models\BillElement;
 use Modules\Billing\Models\BillElementMapper;
+use Modules\Billing\Models\BillMapper;
 use Modules\Billing\Models\NullBillType;
+use Modules\ClientManagement\Models\ClientMapper;
 use Modules\ClientManagement\Models\NullClient;
-use phpOMS\Message\Http\HttpRequest;
-use phpOMS\Message\Http\HttpResponse;
+use Modules\ItemManagement\Models\ItemMapper;
+use phpOMS\Localization\Money;
 use phpOMS\Message\Http\RequestStatusCode;
 use phpOMS\Message\NotificationLevel;
 use phpOMS\Message\RequestAbstract;
 use phpOMS\Message\ResponseAbstract;
 use phpOMS\Model\Message\FormValidation;
-use phpOMS\Utils\Parser\Markdown\Markdown;
-use Modules\ItemManagement\Models\ItemMapper;
-use phpOMS\Localization\Money;
-use Modules\ClientManagement\Models\ClientMapper;
 
 /**
  * Billing class.
@@ -90,9 +87,9 @@ final class ApiController extends Controller
         $bill->number = '{y}-{id}'; // @todo: use admin defined format
         $bill->billTo = $request->getData('billto')
             ?? ($client->profile->account->name1 . (!empty($client->profile->account->name2) ? ', ' . $client->profile->account->name2 : '')); // @todo: use defaultInvoiceAddress or mainAddress. also consider to use billto1, billto2, billto3 (for multiple lines e.g. name2, fao etc.)
-        $bill->billCountry = $request->getData('billtocountry') ?? $client->mainAddress->getCountry();
-        $bill->type = new NullBillType((int) $request->getData('type'));
-        $bill->client = new NullClient((int) $request->getData('client'));
+        $bill->billCountry     = $request->getData('billtocountry') ?? $client->mainAddress->getCountry();
+        $bill->type            = new NullBillType((int) $request->getData('type'));
+        $bill->client          = new NullClient((int) $request->getData('client'));
         $bill->performanceDate = new \DateTime($request->getData('performancedate') ?? 'now');
 
         return $bill;
@@ -168,7 +165,7 @@ final class ApiController extends Controller
      */
     public function createBillElementFromRequest(RequestAbstract $request, ResponseAbstract $response, $data = null) : BillElement
     {
-        $element = new BillElement();
+        $element       = new BillElement();
         $element->bill = (int) $request->getData('bill');
         $element->item = $request->getData('item', 'int');
 
@@ -179,11 +176,11 @@ final class ApiController extends Controller
         $item = ItemMapper::withConditional('language', $response->getLanguage())::get($element->item);
         // @todo: which item name should be stored in the database? server language (problem for international company with subsidiaries)? customer default language/customer invoice language?
         $element->itemNumber = $item->number;
-        $element->itemName = $item->getL11n('name1')->description;
-        $element->quantity = $request->getData('quantity', 'int');
+        $element->itemName   = $item->getL11n('name1')->description;
+        $element->quantity   = $request->getData('quantity', 'int');
 
         $element->singleSalesPriceNet = new Money($request->getData('singlesalespricenet', 'int') ?? $item->salesPrice->getInt());
-        $element->totalSalesPriceNet = clone $element->singleSalesPriceNet;
+        $element->totalSalesPriceNet  = clone $element->singleSalesPriceNet;
         $element->totalSalesPriceNet->mult($element->quantity);
 
         // discounts
@@ -193,7 +190,7 @@ final class ApiController extends Controller
         }
 
         $element->singlePurchasePriceNet = new Money($item->purchasePrice->getInt());
-        $element->totalPurchasePriceNet = clone $element->singlePurchasePriceNet;
+        $element->totalPurchasePriceNet  = clone $element->singlePurchasePriceNet;
         $element->totalPurchasePriceNet->mult($element->quantity);
 
         return $element;
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index e99e471..db8eb54 100644
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -15,13 +15,11 @@ declare(strict_types=1);
 namespace Modules\Billing\Controller;
 
 use Modules\Billing\Models\BillMapper;
+use Modules\Billing\Models\BillTypeL11n;
 use phpOMS\Contract\RenderableInterface;
 use phpOMS\Message\RequestAbstract;
 use phpOMS\Message\ResponseAbstract;
 use phpOMS\Views\View;
-use Modules\Billing\Models\BillType;
-use Modules\Billing\Models\BillTypeL11n;
-use phpOMS\DataStorage\Database\RelationType;
 
 /**
  * Billing class.
diff --git a/Models/Bill.php b/Models/Bill.php
index c6bd247..3af86ea 100644
--- a/Models/Bill.php
+++ b/Models/Bill.php
@@ -51,7 +51,9 @@ class Bill implements \JsonSerializable
      * @var int|BillType
      * @since 1.0.0
      */
-    public int|BillType $type = 0;
+    public int |
+
+BillType $type = 0;
 
     /**
      * Bill status.
@@ -246,15 +248,15 @@ class Bill implements \JsonSerializable
      */
     public function __construct()
     {
-        $this->net       = new Money(0);
-        $this->gross     = new Money(0);
-        $this->costs     = new Money(0);
+        $this->net        = new Money(0);
+        $this->gross      = new Money(0);
+        $this->costs      = new Money(0);
         $this->profit     = new Money(0);
 
-        $this->createdAt = new \DateTimeImmutable();
+        $this->createdAt       = new \DateTimeImmutable();
         $this->performanceDate = new \DateTime();
-        $this->createdBy = new NullAccount();
-        $this->referer = new NullAccount();
+        $this->createdBy       = new NullAccount();
+        $this->referer         = new NullAccount();
     }
 
     /**
diff --git a/Models/BillElement.php b/Models/BillElement.php
index 5c2e30b..b439987 100644
--- a/Models/BillElement.php
+++ b/Models/BillElement.php
@@ -83,10 +83,10 @@ class BillElement implements \JsonSerializable
     public function __construct()
     {
         $this->singleSalesPriceNet = new Money();
-        $this->totalSalesPriceNet = new Money();
+        $this->totalSalesPriceNet  = new Money();
 
         $this->singlePurchasePriceNet = new Money();
-        $this->totalPurchasePriceNet = new Money();
+        $this->totalPurchasePriceNet  = new Money();
     }
 
     /**
diff --git a/Models/BillElementMapper.php b/Models/BillElementMapper.php
index 629b3a7..03270a8 100644
--- a/Models/BillElementMapper.php
+++ b/Models/BillElementMapper.php
@@ -14,7 +14,6 @@ declare(strict_types=1);
 
 namespace Modules\Billing\Models;
 
-use Modules\ClientManagement\Models\ClientMapper;
 use phpOMS\DataStorage\Database\DataMapperAbstract;
 
 /**
@@ -34,18 +33,18 @@ final class BillElementMapper extends DataMapperAbstract
      * @since 1.0.0
      */
     protected static array $columns = [
-        'billing_out_element_id'            => ['name' => 'billing_out_element_id',      'type' => 'int',    'internal' => 'id'],
-        'billing_out_element_order'            => ['name' => 'billing_out_element_order',      'type' => 'int',    'internal' => 'order'],
-        'billing_out_element_item'            => ['name' => 'billing_out_element_item',      'type' => 'int',    'internal' => 'item'],
-        'billing_out_element_item_number'            => ['name' => 'billing_out_element_item_number',      'type' => 'string',    'internal' => 'itemNumber'],
-        'billing_out_element_item_name'            => ['name' => 'billing_out_element_item_name',      'type' => 'string',    'internal' => 'itemName'],
-        'billing_out_element_item_desc'            => ['name' => 'billing_out_element_item_desc',      'type' => 'string',    'internal' => 'itemDescription'],
-        'billing_out_element_quantity'            => ['name' => 'billing_out_element_quantity',      'type' => 'int',    'internal' => 'quantity'],
-        'billing_out_element_single_salesprice_net'            => ['name' => 'billing_out_element_single_salesprice_net',      'type' => 'Serializable',    'internal' => 'singleSalesPriceNet'],
+        'billing_out_element_id'                                  => ['name' => 'billing_out_element_id',      'type' => 'int',    'internal' => 'id'],
+        'billing_out_element_order'                               => ['name' => 'billing_out_element_order',      'type' => 'int',    'internal' => 'order'],
+        'billing_out_element_item'                                => ['name' => 'billing_out_element_item',      'type' => 'int',    'internal' => 'item'],
+        'billing_out_element_item_number'                         => ['name' => 'billing_out_element_item_number',      'type' => 'string',    'internal' => 'itemNumber'],
+        'billing_out_element_item_name'                           => ['name' => 'billing_out_element_item_name',      'type' => 'string',    'internal' => 'itemName'],
+        'billing_out_element_item_desc'                           => ['name' => 'billing_out_element_item_desc',      'type' => 'string',    'internal' => 'itemDescription'],
+        'billing_out_element_quantity'                            => ['name' => 'billing_out_element_quantity',      'type' => 'int',    'internal' => 'quantity'],
+        'billing_out_element_single_salesprice_net'               => ['name' => 'billing_out_element_single_salesprice_net',      'type' => 'Serializable',    'internal' => 'singleSalesPriceNet'],
         'billing_out_element_single_purchaseprice_net'            => ['name' => 'billing_out_element_single_purchaseprice_net',      'type' => 'Serializable',    'internal' => 'singlePurchasePriceNet'],
-        'billing_out_element_total_salesprice_net'            => ['name' => 'billing_out_element_total_salesprice_net',      'type' => 'Serializable',    'internal' => 'totalSalesPriceNet'],
-        'billing_out_element_total_purchaseprice_net'            => ['name' => 'billing_out_element_total_purchaseprice_net',      'type' => 'Serializable',    'internal' => 'totalPurchasePriceNet'],
-        'billing_out_element_bill'            => ['name' => 'billing_out_element_bill',      'type' => 'int',    'internal' => 'bill'],
+        'billing_out_element_total_salesprice_net'                => ['name' => 'billing_out_element_total_salesprice_net',      'type' => 'Serializable',    'internal' => 'totalSalesPriceNet'],
+        'billing_out_element_total_purchaseprice_net'             => ['name' => 'billing_out_element_total_purchaseprice_net',      'type' => 'Serializable',    'internal' => 'totalPurchasePriceNet'],
+        'billing_out_element_bill'                                => ['name' => 'billing_out_element_bill',      'type' => 'int',    'internal' => 'bill'],
     ];
 
     /**
diff --git a/Models/BillMapper.php b/Models/BillMapper.php
index 00c9006..ec439c7 100644
--- a/Models/BillMapper.php
+++ b/Models/BillMapper.php
@@ -18,9 +18,9 @@ use Modules\Admin\Models\AccountMapper;
 use Modules\ClientManagement\Models\ClientMapper;
 use phpOMS\DataStorage\Database\DataMapperAbstract;
 use phpOMS\DataStorage\Database\Query\Builder;
-use phpOMS\Localization\Money;
 use phpOMS\DataStorage\Database\RelationType;
 use phpOMS\Localization\Defaults\CountryMapper;
+use phpOMS\Localization\Money;
 
 /**
  * Mapper class.
@@ -39,41 +39,41 @@ final class BillMapper extends DataMapperAbstract
      * @since 1.0.0
      */
     protected static array $columns = [
-        'billing_out_id'            => ['name' => 'billing_out_id',      'type' => 'int',    'internal' => 'id'],
-        'billing_out_number'        => ['name' => 'billing_out_number',      'type' => 'string',    'internal' => 'number'],
-        'billing_out_type'          => ['name' => 'billing_out_type',      'type' => 'int',    'internal' => 'type'],
-        'billing_out_info'          => ['name' => 'billing_out_info',      'type' => 'string',    'internal' => 'info'],
-        'billing_out_status'        => ['name' => 'billing_out_status',      'type' => 'int',    'internal' => 'status'],
-        'billing_out_shipTo'        => ['name' => 'billing_out_shipTo',      'type' => 'string',    'internal' => 'shipTo'],
-        'billing_out_shipFAO'       => ['name' => 'billing_out_shipFAO',      'type' => 'string',    'internal' => 'shipFAO'],
-        'billing_out_shipAddr'      => ['name' => 'billing_out_shipAddr',      'type' => 'string',    'internal' => 'shipAddress'],
-        'billing_out_shipCity'      => ['name' => 'billing_out_shipCity',      'type' => 'string',    'internal' => 'shipCity'],
-        'billing_out_shipZip'       => ['name' => 'billing_out_shipZip',      'type' => 'string',    'internal' => 'shipZip'],
-        'billing_out_shipCountry'   => ['name' => 'billing_out_shipCountry',      'type' => 'string',    'internal' => 'shipCountry'],
-        'billing_out_billTo'        => ['name' => 'billing_out_billTo',      'type' => 'string',    'internal' => 'billTo'],
-        'billing_out_billFAO'       => ['name' => 'billing_out_billFAO',      'type' => 'string',    'internal' => 'billFAO'],
-        'billing_out_billAddr'      => ['name' => 'billing_out_billAddr',      'type' => 'string',    'internal' => 'billAddress'],
-        'billing_out_billCity'      => ['name' => 'billing_out_billCity',      'type' => 'string',    'internal' => 'billCity'],
-        'billing_out_billZip'       => ['name' => 'billing_out_billZip',      'type' => 'string',    'internal' => 'billZip'],
-        'billing_out_billCountry'   => ['name' => 'billing_out_billCountry',      'type' => 'string',    'internal' => 'billCountry'],
-        'billing_out_gross'         => ['name' => 'billing_out_gross',      'type' => 'Serializable',    'internal' => 'gross'],
-        'billing_out_net'           => ['name' => 'billing_out_net',      'type' => 'Serializable',    'internal' => 'net'],
-        'billing_out_costs'         => ['name' => 'billing_out_costs',      'type' => 'Serializable',    'internal' => 'costs'],
-        'billing_out_profit'        => ['name' => 'billing_out_profit',      'type' => 'Serializable',    'internal' => 'profit'],
-        'billing_out_currency'      => ['name' => 'billing_out_currency',      'type' => 'int',    'internal' => 'currency'],
-        'billing_out_referral' => ['name' => 'billing_out_referral',      'type' => 'int',    'internal' => 'referral'],
-        'billing_out_referral_name' => ['name' => 'billing_out_referral_name',      'type' => 'string',    'internal' => 'referralName'],
-        'billing_out_reference'     => ['name' => 'billing_out_reference',      'type' => 'int',    'internal' => 'reference'],
-        'billing_out_payment'       => ['name' => 'billing_out_payment',      'type' => 'int',    'internal' => 'payment'],
-        'billing_out_payment_text'  => ['name' => 'billing_out_payment_text',      'type' => 'string',    'internal' => 'paymentText'],
-        'billing_out_paymentterms'     => ['name' => 'billing_out_paymentterms',      'type' => 'int',    'internal' => 'terms'],
+        'billing_out_id'                    => ['name' => 'billing_out_id',      'type' => 'int',    'internal' => 'id'],
+        'billing_out_number'                => ['name' => 'billing_out_number',      'type' => 'string',    'internal' => 'number'],
+        'billing_out_type'                  => ['name' => 'billing_out_type',      'type' => 'int',    'internal' => 'type'],
+        'billing_out_info'                  => ['name' => 'billing_out_info',      'type' => 'string',    'internal' => 'info'],
+        'billing_out_status'                => ['name' => 'billing_out_status',      'type' => 'int',    'internal' => 'status'],
+        'billing_out_shipTo'                => ['name' => 'billing_out_shipTo',      'type' => 'string',    'internal' => 'shipTo'],
+        'billing_out_shipFAO'               => ['name' => 'billing_out_shipFAO',      'type' => 'string',    'internal' => 'shipFAO'],
+        'billing_out_shipAddr'              => ['name' => 'billing_out_shipAddr',      'type' => 'string',    'internal' => 'shipAddress'],
+        'billing_out_shipCity'              => ['name' => 'billing_out_shipCity',      'type' => 'string',    'internal' => 'shipCity'],
+        'billing_out_shipZip'               => ['name' => 'billing_out_shipZip',      'type' => 'string',    'internal' => 'shipZip'],
+        'billing_out_shipCountry'           => ['name' => 'billing_out_shipCountry',      'type' => 'string',    'internal' => 'shipCountry'],
+        'billing_out_billTo'                => ['name' => 'billing_out_billTo',      'type' => 'string',    'internal' => 'billTo'],
+        'billing_out_billFAO'               => ['name' => 'billing_out_billFAO',      'type' => 'string',    'internal' => 'billFAO'],
+        'billing_out_billAddr'              => ['name' => 'billing_out_billAddr',      'type' => 'string',    'internal' => 'billAddress'],
+        'billing_out_billCity'              => ['name' => 'billing_out_billCity',      'type' => 'string',    'internal' => 'billCity'],
+        'billing_out_billZip'               => ['name' => 'billing_out_billZip',      'type' => 'string',    'internal' => 'billZip'],
+        'billing_out_billCountry'           => ['name' => 'billing_out_billCountry',      'type' => 'string',    'internal' => 'billCountry'],
+        'billing_out_gross'                 => ['name' => 'billing_out_gross',      'type' => 'Serializable',    'internal' => 'gross'],
+        'billing_out_net'                   => ['name' => 'billing_out_net',      'type' => 'Serializable',    'internal' => 'net'],
+        'billing_out_costs'                 => ['name' => 'billing_out_costs',      'type' => 'Serializable',    'internal' => 'costs'],
+        'billing_out_profit'                => ['name' => 'billing_out_profit',      'type' => 'Serializable',    'internal' => 'profit'],
+        'billing_out_currency'              => ['name' => 'billing_out_currency',      'type' => 'int',    'internal' => 'currency'],
+        'billing_out_referral'              => ['name' => 'billing_out_referral',      'type' => 'int',    'internal' => 'referral'],
+        'billing_out_referral_name'         => ['name' => 'billing_out_referral_name',      'type' => 'string',    'internal' => 'referralName'],
+        'billing_out_reference'             => ['name' => 'billing_out_reference',      'type' => 'int',    'internal' => 'reference'],
+        'billing_out_payment'               => ['name' => 'billing_out_payment',      'type' => 'int',    'internal' => 'payment'],
+        'billing_out_payment_text'          => ['name' => 'billing_out_payment_text',      'type' => 'string',    'internal' => 'paymentText'],
+        'billing_out_paymentterms'          => ['name' => 'billing_out_paymentterms',      'type' => 'int',    'internal' => 'terms'],
         'billing_out_paymentterms_text'     => ['name' => 'billing_out_paymentterms_text',      'type' => 'string',    'internal' => 'termsText'],
-        'billing_out_ship_type'     => ['name' => 'billing_out_ship_type',      'type' => 'int',    'internal' => 'shipping'],
-        'billing_out_ship_text'     => ['name' => 'billing_out_ship_text',      'type' => 'string',    'internal' => 'shippingText'],
-        'billing_out_client'    => ['name' => 'billing_out_client', 'type' => 'int',      'internal' => 'client'],
-        'billing_out_created_by'    => ['name' => 'billing_out_created_by', 'type' => 'int',      'internal' => 'createdBy', 'readonly' => true],
-        'billing_out_performance_date'    => ['name' => 'billing_out_performance_date', 'type' => 'DateTime', 'internal' => 'performanceDate', 'readonly' => true],
-        'billing_out_created_at'    => ['name' => 'billing_out_created_at', 'type' => 'DateTimeImmutable', 'internal' => 'createdAt', 'readonly' => true],
+        'billing_out_ship_type'             => ['name' => 'billing_out_ship_type',      'type' => 'int',    'internal' => 'shipping'],
+        'billing_out_ship_text'             => ['name' => 'billing_out_ship_text',      'type' => 'string',    'internal' => 'shippingText'],
+        'billing_out_client'                => ['name' => 'billing_out_client', 'type' => 'int',      'internal' => 'client'],
+        'billing_out_created_by'            => ['name' => 'billing_out_created_by', 'type' => 'int',      'internal' => 'createdBy', 'readonly' => true],
+        'billing_out_performance_date'      => ['name' => 'billing_out_performance_date', 'type' => 'DateTime', 'internal' => 'performanceDate', 'readonly' => true],
+        'billing_out_created_at'            => ['name' => 'billing_out_created_at', 'type' => 'DateTimeImmutable', 'internal' => 'createdAt', 'readonly' => true],
     ];
 
     /**
@@ -221,12 +221,10 @@ final class BillMapper extends DataMapperAbstract
 
     public static function getItemRetentionRate(int $id, \DateTime $start, \DateTime $end) : float
     {
-
     }
 
     public static function getItemLivetimeValue(int $id, \DateTime $start, \DateTime $end) : Money
     {
-
     }
 
     public static function getNewestItemInvoices(int $id, int $limit = 10) : array
@@ -287,7 +285,7 @@ final class BillMapper extends DataMapperAbstract
             ->groupBy(ClientMapper::getTable() . '_' . $depth . '.clientmgmt_client_id');
 
         $clients = ClientMapper::getAllByQuery($query, RelationType::ALL, $depth);
-        $data = ClientMapper::getDataLastQuery();
+        $data    = ClientMapper::getDataLastQuery();
 
         return [$clients, $data];
     }
diff --git a/Models/BillStatus.php b/Models/BillStatus.php
index 7037ec4..67ec8d5 100644
--- a/Models/BillStatus.php
+++ b/Models/BillStatus.php
@@ -27,8 +27,12 @@ use phpOMS\Stdlib\Base\Enum;
 abstract class BillStatus extends Enum
 {
     public const ACTIVE   = 1;
+
     public const ARCHIVED = 2;
+
     public const DELETED  = 4;
+
     public const DONE     = 8;
+
     public const DRAFT    = 16;
 }
diff --git a/Models/BillType.php b/Models/BillType.php
index b51609f..20085ef 100644
--- a/Models/BillType.php
+++ b/Models/BillType.php
@@ -26,7 +26,7 @@ use phpOMS\Localization\ISO639x1Enum;
  */
 class BillType
 {
-	/**
+    /**
      * Id
      *
      * @var int
@@ -34,7 +34,7 @@ class BillType
      */
     protected int $id = 0;
 
-	/**
+    /**
      * Localization
      *
      * @var int|int[]|BillTypeL11n|BillTypeL11n[]
@@ -69,7 +69,7 @@ class BillType
      * Set l11n
      *
      * @param string|BillTypeL11n $l11n Tag article l11n
-     * @param string                       $lang Language
+     * @param string              $lang Language
      *
      * @return void
      *
@@ -83,7 +83,7 @@ class BillType
             $this->l11n->name = $l11n;
         } elseif (\is_string($l11n)) {
             $this->l11n        = new BillTypeL11n();
-            $this->l11n->name = $l11n;
+            $this->l11n->name  = $l11n;
             $this->l11n->setLanguage($lang);
         }
     }
diff --git a/Models/BillTypeL11n.php b/Models/BillTypeL11n.php
index 12838dd..71a4e51 100644
--- a/Models/BillTypeL11n.php
+++ b/Models/BillTypeL11n.php
@@ -41,7 +41,9 @@ class BillTypeL11n implements \JsonSerializable, ArrayableInterface
      * @var int
      * @since 1.0.0
      */
-    protected int|BillType $type = 0;
+    protected int |
+
+BillType $type = 0;
 
     /**
      * Language.
@@ -63,12 +65,12 @@ class BillTypeL11n implements \JsonSerializable, ArrayableInterface
      * Constructor.
      *
      * @param int|BillType $type     Attribute type
-     * @param string       $name    Localized name
+     * @param string       $name     Localized name
      * @param string       $language Language
      *
      * @since 1.0.0
      */
-    public function __construct(int|BillType $type = 0, string $name = '', string $language = ISO639x1Enum::_EN)
+    public function __construct(int | BillType $type = 0, string $name = '', string $language = ISO639x1Enum::_EN)
     {
         $this->type     = $type;
         $this->name     = $name;
@@ -146,7 +148,7 @@ class BillTypeL11n implements \JsonSerializable, ArrayableInterface
     {
         return [
             'id'       => $this->id,
-            'name'    => $this->name,
+            'name'     => $this->name,
             'type'     => $this->type,
             'language' => $this->language,
         ];
diff --git a/Models/BillTypeL11nMapper.php b/Models/BillTypeL11nMapper.php
index 89938e4..7a74c51 100644
--- a/Models/BillTypeL11nMapper.php
+++ b/Models/BillTypeL11nMapper.php
@@ -33,10 +33,10 @@ final class BillTypeL11nMapper extends DataMapperAbstract
      * @since 1.0.0
      */
     protected static array $columns = [
-        'billing_type_l11n_id'       => ['name' => 'billing_type_l11n_id',       'type' => 'int',    'internal' => 'id'],
-        'billing_type_l11n_name'    => ['name' => 'billing_type_l11n_name',    'type' => 'string', 'internal' => 'name', 'autocomplete' => true],
+        'billing_type_l11n_id'        => ['name' => 'billing_type_l11n_id',       'type' => 'int',    'internal' => 'id'],
+        'billing_type_l11n_name'      => ['name' => 'billing_type_l11n_name',    'type' => 'string', 'internal' => 'name', 'autocomplete' => true],
         'billing_type_l11n_type'      => ['name' => 'billing_type_l11n_type',      'type' => 'int',    'internal' => 'type'],
-        'billing_type_l11n_language' => ['name' => 'billing_type_l11n_language', 'type' => 'string', 'internal' => 'language'],
+        'billing_type_l11n_language'  => ['name' => 'billing_type_l11n_language', 'type' => 'string', 'internal' => 'language'],
     ];
 
     /**
diff --git a/Models/NullBillType.php b/Models/NullBillType.php
index 448ddc6..ee5edb3 100644
--- a/Models/NullBillType.php
+++ b/Models/NullBillType.php
@@ -24,7 +24,7 @@ namespace Modules\Billing\Models;
  */
 final class NullBillType extends BillType
 {
-	/**
+    /**
      * Constructor
      *
      * @param int $id Model id
diff --git a/Models/PermissionState.php b/Models/PermissionState.php
index 135aca9..ecc567f 100644
--- a/Models/PermissionState.php
+++ b/Models/PermissionState.php
@@ -27,5 +27,6 @@ use phpOMS\Stdlib\Base\Enum;
 abstract class PermissionState extends Enum
 {
     public const SALES_INVOICE    = 1;
+
     public const PURCHASE_INVOICE = 2;
 }
diff --git a/Theme/Backend/purchase-invoice-list.tpl.php b/Theme/Backend/purchase-invoice-list.tpl.php
index 419bfd0..4e7aaef 100644
--- a/Theme/Backend/purchase-invoice-list.tpl.php
+++ b/Theme/Backend/purchase-invoice-list.tpl.php
@@ -12,7 +12,6 @@
  */
 declare(strict_types=1);
 
-
 $footerView   = new \phpOMS\Views\PaginationView($this->l11nManager, $this->request, $this->response);
 $footerView->setTemplate('/Web/Templates/Lists/Footer/PaginationBig');
 $footerView->setPages(20);
diff --git a/Theme/Backend/sales-bill.tpl.php b/Theme/Backend/sales-bill.tpl.php
index 1f3816c..a0baa91 100644
--- a/Theme/Backend/sales-bill.tpl.php
+++ b/Theme/Backend/sales-bill.tpl.php
@@ -16,7 +16,7 @@ declare(strict_types=1);
  * @var \phpOMS\Views\View $this
  */
 
-$bill = $this->getData('bill');
+$bill     = $this->getData('bill');
 $elements = $bill->getElements();
 
 echo $this->getData('nav')->render(); ?>
@@ -153,7 +153,7 @@ echo $this->getData('nav')->render(); ?>
                                 <td><i class="fa fa-plus add"></i> <i class="fa fa-chevron-up order-up"></i> <i class="fa fa-chevron-down order-down"></i>
                                 <td><span class="input"><button type="button" formaction=""><i class="fa fa-book"></i></button><input type="text" value="<?= $element->itemNumber; ?>" required></span>
                                 <td><textarea required><?= $element->itemName; ?></textarea>
-                                <td><input type="number" min="0" value="<?= $element->quantity ?>" required>
+                                <td><input type="number" min="0" value="<?= $element->quantity; ?>" required>
                                 <td><input type="text" value="<?= $element->singleSalesPriceNet->getCurrency(); ?>">
                                 <td><input type="number" min="0">
                                 <td><input type="number" min="0" max="100" step="any">