diff --git a/Admin/Install/Admin.install.php b/Admin/Install/Admin.install.php
index 096918f..7ec3a28 100644
--- a/Admin/Install/Admin.install.php
+++ b/Admin/Install/Admin.install.php
@@ -18,10 +18,10 @@ use Modules\ClientManagement\Models\SettingsEnum;
 return [
     [
         "description" => "Default item segmentation (segment, section, sales group, product group)",
-        'type'    => 'setting',
-        'name'    => SettingsEnum::DEFAULT_SEGMENTATION,
-        'content' => '{"segment":1, "section":1, "client_group":1}',
-        'pattern' => '',
-        'module'  => ApiController::NAME,
+        'type'        => 'setting',
+        'name'        => SettingsEnum::DEFAULT_SEGMENTATION,
+        'content'     => '{"segment":1, "section":1, "client_group":1}',
+        'pattern'     => '',
+        'module'      => ApiController::NAME,
     ],
 ];
diff --git a/Admin/Install/attributes.json b/Admin/Install/attributes.json
index c8bb287..bc5bb08 100755
--- a/Admin/Install/attributes.json
+++ b/Admin/Install/attributes.json
@@ -245,6 +245,7 @@
             { "value": "FI" },
             { "value": "FR" },
             { "value": "DE" },
+            { "value": "DE_0" },
             { "value": "GR" },
             { "value": "HU" },
             { "value": "IE" },
diff --git a/Admin/Installer.php b/Admin/Installer.php
index a2cfba3..2c308dd 100755
--- a/Admin/Installer.php
+++ b/Admin/Installer.php
@@ -62,8 +62,9 @@ final class Installer extends InstallerAbstract
         $attrValues = self::createClientAttributeValues($app, $attrTypes, $attributes);
 
         $data = include __DIR__ . '/Install/Admin.install.php';
-        $content = \json_decode($data[0]['content'], true);
 
+        /** @var array $content */
+        $content = \json_decode($data[0]['content'], true);
         foreach ($content as $type => $_) {
             $content[$type] = \reset($attrValues[$type])['id'];
         }
diff --git a/Controller/ApiController.php b/Controller/ApiController.php
index 8da45ee..3334459 100755
--- a/Controller/ApiController.php
+++ b/Controller/ApiController.php
@@ -88,6 +88,16 @@ final class ApiController extends Controller
         return $client->id === 0 ? null : $client;
     }
 
+    /**
+     * Set VAT for client
+     *
+     * @param RequestAbstract $request Request
+     * @param Client          $client  Client
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
     public function setVAT(RequestAbstract $request, Client $client) : void
     {
         /** @var \Modules\Attribute\Models\AttributeType $type */
@@ -105,6 +115,16 @@ final class ApiController extends Controller
             ->apiClientAttributeCreate($internalRequest, $internalResponse);
     }
 
+    /**
+     * Validate VAT of client
+     *
+     * @param RequestAbstract $request Request
+     * @param Client          $client  Client
+     *
+     * @return array
+     *
+     * @since 1.0.0
+     */
     public function validateVAT(RequestAbstract $request, Client $client) : array
     {
         /** @var \Modules\Organization\Models\Unit $unit */
@@ -146,6 +166,16 @@ final class ApiController extends Controller
         return $validate;
     }
 
+    /**
+     * Set tax code for client
+     *
+     * @param RequestAbstract $request Request
+     * @param Client          $client  Client
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
     public function defineTaxCode(RequestAbstract $request, Client $client) : void
     {
         /** @var \Modules\Organization\Models\Unit $unit */
@@ -246,16 +276,31 @@ final class ApiController extends Controller
         $this->createStandardCreateResponse($request, $response, $client);
     }
 
+    /**
+     * Create client segmentation.
+     *
+     * Default: segment->section->sales_group and to the side client_type
+     *
+     * @param RequestAbstract  $request  Request
+     * @param ResponseAbstract $response Response
+     * @param Client           $client   Client
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
     private function createClientSegmentation(RequestAbstract $request, ResponseAbstract $response, Client $client) : void
     {
         /** @var \Model\Setting $settings */
         $settings = $this->app->appSettings->get(null, SettingsEnum::DEFAULT_SEGMENTATION);
 
+        /** @var array $segmentation */
         $segmentation = \json_decode($settings->content, true);
         if ($segmentation === false || $segmentation === null) {
             return;
         }
 
+        /** @var \Modules\Attribute\Models\AttributeType[] $types */
         $types = ClientAttributeTypeMapper::getAll()
             ->where('name', \array_keys($segmentation), 'IN')
             ->execute();
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index 8b48645..6839a3e 100755
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -226,7 +226,6 @@ final class BackendController extends Controller
             $pkValue = $request->getDataString('number');
         }
 
-        /** @var \Modules\ClientManagement\Models\Client */
         $view->data['client'] = ClientMapper::get()
             ->with('account')
             ->with('account/addresses')
@@ -253,7 +252,6 @@ final class BackendController extends Controller
         $view->data['attributeView']                               = new \Modules\Attribute\Theme\Backend\Components\AttributeView($this->app->l11nManager, $request, $response);
         $view->data['attributeView']->data['default_localization'] = $this->app->l11nServer;
 
-        /** @var \Modules\Attribute\Models\AttributeType[] */
         $view->data['attributeTypes'] = ClientAttributeTypeMapper::getAll()
             ->with('l11n')
             ->where('l11n/language', $response->header->l11n->language)
@@ -292,7 +290,6 @@ final class BackendController extends Controller
 
         $view->data['hasBilling'] = $this->app->moduleManager->isActive('Billing');
 
-        /** @var \Modules\Billing\Models\Price\Price[] */
         $view->data['prices'] = $view->data['hasBilling']
             ? \Modules\Billing\Models\Price\PriceMapper::getAll()
                 ->where('client', $view->data['client']->id)
@@ -300,6 +297,7 @@ final class BackendController extends Controller
                 ->execute()
             : [];
 
+        /** @var \Modules\Attribute\Models\AttributeType[] $tmp */
         $tmp = ItemAttributeTypeMapper::getAll()
             ->with('defaults')
             ->with('defaults/l11n')
@@ -308,8 +306,8 @@ final class BackendController extends Controller
                 'sales_tax_code', 'purchase_tax_code',
             ], 'IN')
             ->where('defaults/l11n', (new Where($this->app->dbPool->get()))
-                ->where(ItemAttributeValueL11nMapper::getColumnByMember('ref'), '=', null)
-                ->orWhere(ItemAttributeValueL11nMapper::getColumnByMember('language'), '=', $response->header->l11n->language))
+                ->where(ItemAttributeValueL11nMapper::getColumnByMember('ref') ?? '', '=', null)
+                ->orWhere(ItemAttributeValueL11nMapper::getColumnByMember('language') ?? '', '=', $response->header->l11n->language))
             ->execute();
 
         $defaultAttributeTypes = [];
@@ -319,6 +317,7 @@ final class BackendController extends Controller
 
         $view->data['defaultAttributeTypes'] = $defaultAttributeTypes;
 
+        /** @var \Modules\Attribute\Models\AttributeType[] $tmp */
         $tmp = ClientAttributeTypeMapper::getAll()
             ->with('defaults')
             ->with('defaults/l11n')
@@ -327,8 +326,8 @@ final class BackendController extends Controller
                 'sales_tax_code',
             ], 'IN')
             ->where('defaults/l11n', (new Where($this->app->dbPool->get()))
-                ->where(ClientAttributeValueL11nMapper::getColumnByMember('ref'), '=', null)
-                ->orWhere(ClientAttributeValueL11nMapper::getColumnByMember('language'), '=', $response->header->l11n->language))
+                ->where(ClientAttributeValueL11nMapper::getColumnByMember('ref') ?? '', '=', null)
+                ->orWhere(ClientAttributeValueL11nMapper::getColumnByMember('language') ?? '', '=', $response->header->l11n->language))
             ->execute();
 
         $clientSegmentationTypes = [];
@@ -359,7 +358,6 @@ final class BackendController extends Controller
 
         // @todo join audit with files, attributes, localization, prices, notes, ...
 
-        /** @var \Modules\Media\Models\Media[] */
         $view->data['files'] = MediaMapper::getAll()
             ->with('types')
             ->join('id', ClientMapper::class, 'files') // id = media id, files = client relations
diff --git a/Controller/SearchController.php b/Controller/SearchController.php
index 40d6e25..03e4a3d 100644
--- a/Controller/SearchController.php
+++ b/Controller/SearchController.php
@@ -48,7 +48,7 @@ final class SearchController extends Controller
      */
     public function searchGeneral(RequestAbstract $request, ResponseAbstract $response, array $data = []) : void
     {
-        $names = \explode(' ', ($request->getDataString('search') ?? ''));
+        $names   = \explode(' ', ($request->getDataString('search') ?? ''));
         $names[] = ($request->getDataString('search') ?? '');
 
         $mapper = ClientMapper::getAll()
@@ -72,7 +72,7 @@ final class SearchController extends Controller
             // Get item profile image
             // @feature Create a new read mapper function that returns relation models instead of its own model
             //      https://github.com/Karaka-Management/phpOMS/issues/320
-            $query   = new Builder($this->app->dbPool->get());
+            $query    = new Builder($this->app->dbPool->get());
             $iResults = $query->selectAs(ClientMapper::HAS_MANY['files']['external'], 'file')
                 ->from(ClientMapper::TABLE)
                 ->leftJoin(ClientMapper::HAS_MANY['files']['table'])
@@ -92,16 +92,16 @@ final class SearchController extends Controller
                 ->execute();
 
             $results[] = [
-                'title'     => $account->account->name1 . ' ' . $account->account->name2,
-                'link'      => '{/base}/sales/client/view?id=' . $account->id,
+                'title' => $account->account->name1 . ' ' . $account->account->name2,
+                'link'  => '{/base}/sales/client/view?id=' . $account->id,
                 'email' => $account->account->getContactByType(ContactType::EMAIL)->content,
                 'phone' => $account->account->getContactByType(ContactType::PHONE)->content,
-                'city' => $account->mainAddress?->city,
+                'city'  => $account->mainAddress->city,
                 'image' => $image->id === 0
                     ? 'Web/Backend/img/logo_grey.png'
                     : $image->getPath(),
-                'type'  => 'list_accounts',
-                'module'  => 'Client Management',
+                'type'   => 'list_accounts',
+                'module' => 'Client Management',
             ];
         }
 
diff --git a/Theme/Backend/Lang/de.lang.php b/Theme/Backend/Lang/de.lang.php
index dbb92ec..c4daa15 100755
--- a/Theme/Backend/Lang/de.lang.php
+++ b/Theme/Backend/Lang/de.lang.php
@@ -77,7 +77,6 @@ return ['ClientManagement' => [
     'Purchase'             => 'Kaufen',
     'Quantity'             => 'Menge',
     'RecentInvoices'       => 'Neuste Rechnungen',
-    'Region'               => 'Region',
     'Sales'                => 'Umsatz',
     'Segment'              => 'Segment',
     'Segments'             => 'Segmente',
@@ -92,7 +91,6 @@ return ['ClientManagement' => [
     'YTDSales'             => 'Ytd Sales',
     'Zip'                  => 'Postleitzahl',
     'ItemProductGroup'     => 'Artikel Produktgruppe',
-    'ItemSalesGroup'       => 'Artikel Umsatzgruppe',
     'Promocode'            => 'Promocode',
     'Region'               => 'Region',
     'Materials'            => 'Materialien',
@@ -104,7 +102,6 @@ return ['ClientManagement' => [
     'PrimarySupplier'      => 'Hauptlieferant',
     'LeadTime'             => 'Lieferzeit',
     'UnitQuantity'         => 'Einheitsmenge',
-    'UnitPrice'            => 'Einheitspreis',
     'Lieferanten'          => 'Lieferanten',
     'CostCenter'           => 'Kostenstelle',
     'CostObject'           => 'Kostenträger',
diff --git a/Theme/Backend/Lang/en.lang.php b/Theme/Backend/Lang/en.lang.php
index 40ae16a..d42d25a 100755
--- a/Theme/Backend/Lang/en.lang.php
+++ b/Theme/Backend/Lang/en.lang.php
@@ -79,7 +79,6 @@ return ['ClientManagement' => [
     'Purchase'             => 'Purchase',
     'Quantity'             => 'Quantity',
     'RecentInvoices'       => 'Recent Invoices',
-    'Region'               => 'Region',
     'Sales'                => 'Sales',
     'Segment'              => 'Segment',
     'Segments'             => 'Segments',
@@ -88,13 +87,11 @@ return ['ClientManagement' => [
     'Title'                => 'Title',
     'TotalPrice'           => 'Total price',
     'Type'                 => 'Type',
-    'UnitPrice'            => 'Unit price',
     'Website'              => 'Website',
     'Wire'                 => 'Wire',
     'YTDSales'             => 'YTD Sales',
     'Zip'                  => 'Zip',
     'ItemProductGroup'     => 'Item Product Group',
-    'ItemSalesGroup'       => 'Item Sales Group',
     'Promocode'            => 'Promocode',
     'Region'               => 'Region',
     'Materials'            => 'Materials',