diff --git a/Admin/Install/attributes.json b/Admin/Install/attributes.json
index 2956872..014f55c 100755
--- a/Admin/Install/attributes.json
+++ b/Admin/Install/attributes.json
@@ -235,19 +235,6 @@
         "default_value": "",
         "values": []
     },
-    {
-        "name": "tax_id",
-        "l11n": {
-            "en": "Tax Id",
-            "de": "Steuernummer"
-        },
-        "value_type": 2,
-        "is_custom_allowed": true,
-        "validation_pattern": "",
-        "is_required": false,
-        "default_value": "",
-        "values": []
-    },
     {
         "name": "legal_form",
         "l11n": {
@@ -346,6 +333,19 @@
         "default_value": "",
         "values": []
     },
+    {
+        "name": "bill_approval",
+        "l11n": {
+            "en": "Approval group",
+            "de": "Freigabegruppe"
+        },
+        "value_type": 2,
+        "is_custom_allowed": true,
+        "validation_pattern": "",
+        "is_required": false,
+        "default_value": "",
+        "values": []
+    },
     {
         "name": "bill_match_pattern",
         "l11n": {
diff --git a/Controller/ApiAttributeController.php b/Controller/ApiAttributeController.php
index f9d0a5f..f6d1732 100644
--- a/Controller/ApiAttributeController.php
+++ b/Controller/ApiAttributeController.php
@@ -243,7 +243,7 @@ final class ApiAttributeController extends Controller
             ->with('type')
             ->with('type/defaults')
             ->with('value')
-            ->where('id', (int) $request->getData('id'))
+            ->where('id', $request->getDataInt('id') ?? 0)
             ->execute();
 
         $new = $this->updateAttributeFromRequest($request, clone $old);
@@ -291,7 +291,7 @@ final class ApiAttributeController extends Controller
 
         $supplierAttribute = SupplierAttributeMapper::get()
             ->with('type')
-            ->where('id', (int) $request->getData('id'))
+            ->where('id', $request->getDataInt('id') ?? 0)
             ->execute();
 
         if ($supplierAttribute->type->isRequired) {
@@ -327,7 +327,7 @@ final class ApiAttributeController extends Controller
         }
 
         /** @var BaseStringL11n $old */
-        $old = SupplierAttributeTypeL11nMapper::get()->where('id', (int) $request->getData('id'))->execute();
+        $old = SupplierAttributeTypeL11nMapper::get()->where('id', $request->getDataInt('id') ?? 0)->execute();
         $new = $this->updateAttributeTypeL11nFromRequest($request, clone $old);
 
         $this->updateModel($request->header->account, $old, $new, SupplierAttributeTypeL11nMapper::class, 'supplier_attribute_type_l11n', $request->getOrigin());
@@ -357,7 +357,7 @@ final class ApiAttributeController extends Controller
         }
 
         /** @var BaseStringL11n $supplierAttributeTypeL11n */
-        $supplierAttributeTypeL11n = SupplierAttributeTypeL11nMapper::get()->where('id', (int) $request->getData('id'))->execute();
+        $supplierAttributeTypeL11n = SupplierAttributeTypeL11nMapper::get()->where('id', $request->getDataInt('id') ?? 0)->execute();
         $this->deleteModel($request->header->account, $supplierAttributeTypeL11n, SupplierAttributeTypeL11nMapper::class, 'supplier_attribute_type_l11n', $request->getOrigin());
         $this->createStandardDeleteResponse($request, $response, $supplierAttributeTypeL11n);
     }
@@ -385,7 +385,7 @@ final class ApiAttributeController extends Controller
         }
 
         /** @var AttributeType $old */
-        $old = SupplierAttributeTypeMapper::get()->with('defaults')->where('id', (int) $request->getData('id'))->execute();
+        $old = SupplierAttributeTypeMapper::get()->with('defaults')->where('id', $request->getDataInt('id') ?? 0)->execute();
         $new = $this->updateAttributeTypeFromRequest($request, clone $old);
 
         $this->updateModel($request->header->account, $old, $new, SupplierAttributeTypeMapper::class, 'supplier_attribute_type', $request->getOrigin());
@@ -417,7 +417,7 @@ final class ApiAttributeController extends Controller
         }
 
         /** @var AttributeType $supplierAttributeType */
-        $supplierAttributeType = SupplierAttributeTypeMapper::get()->with('defaults')->where('id', (int) $request->getData('id'))->execute();
+        $supplierAttributeType = SupplierAttributeTypeMapper::get()->with('defaults')->where('id', $request->getDataInt('id') ?? 0)->execute();
         $this->deleteModel($request->header->account, $supplierAttributeType, SupplierAttributeTypeMapper::class, 'supplier_attribute_type', $request->getOrigin());
         $this->createStandardDeleteResponse($request, $response, $supplierAttributeType);
     }
@@ -445,7 +445,7 @@ final class ApiAttributeController extends Controller
         }
 
         /** @var AttributeValue $old */
-        $old = SupplierAttributeValueMapper::get()->where('id', (int) $request->getData('id'))->execute();
+        $old = SupplierAttributeValueMapper::get()->where('id', $request->getDataInt('id') ?? 0)->execute();
 
         /** @var \Modules\Attribute\Models\Attribute $attr */
         $attr = SupplierAttributeMapper::get()
@@ -485,7 +485,7 @@ final class ApiAttributeController extends Controller
         // }
 
         // /** @var \Modules\SupplierManagement\Models\SupplierAttributeValue $supplierAttributeValue */
-        // $supplierAttributeValue = SupplierAttributeValueMapper::get()->where('id', (int) $request->getData('id'))->execute();
+        // $supplierAttributeValue = SupplierAttributeValueMapper::get()->where('id', $request->getDataInt('id') ?? 0)->execute();
         // $this->deleteModel($request->header->account, $supplierAttributeValue, SupplierAttributeValueMapper::class, 'supplier_attribute_value', $request->getOrigin());
         // $this->createStandardDeleteResponse($request, $response, $supplierAttributeValue);
     }
@@ -513,7 +513,7 @@ final class ApiAttributeController extends Controller
         }
 
         /** @var BaseStringL11n $old */
-        $old = SupplierAttributeValueL11nMapper::get()->where('id', (int) $request->getData('id'));
+        $old = SupplierAttributeValueL11nMapper::get()->where('id', $request->getDataInt('id') ?? 0);
         $new = $this->updateAttributeValueL11nFromRequest($request, clone $old);
 
         $this->updateModel($request->header->account, $old, $new, SupplierAttributeValueL11nMapper::class, 'supplier_attribute_value_l11n', $request->getOrigin());
@@ -543,7 +543,7 @@ final class ApiAttributeController extends Controller
         }
 
         /** @var BaseStringL11n $supplierAttributeValueL11n */
-        $supplierAttributeValueL11n = SupplierAttributeValueL11nMapper::get()->where('id', (int) $request->getData('id'))->execute();
+        $supplierAttributeValueL11n = SupplierAttributeValueL11nMapper::get()->where('id', $request->getDataInt('id') ?? 0)->execute();
         $this->deleteModel($request->header->account, $supplierAttributeValueL11n, SupplierAttributeValueL11nMapper::class, 'supplier_attribute_value_l11n', $request->getOrigin());
         $this->createStandardDeleteResponse($request, $response, $supplierAttributeValueL11n);
     }
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index 2b8203e..a5a5e6a 100755
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -123,7 +123,7 @@ final class BackendController extends Controller
             ->with('l11n')
             ->with('defaults')
             ->with('defaults/l11n')
-            ->where('id', (int) $request->getData('id'))
+            ->where('id', $request->getDataInt('id') ?? 0)
             ->where('l11n/language', $response->header->l11n->language)
             ->where('defaults/l11n/language', [$response->header->l11n->language, null])
             ->execute();
@@ -156,7 +156,7 @@ final class BackendController extends Controller
 
         $view->attribute = SupplierAttributeValueMapper::get()
             ->with('l11n')
-            ->where('id', (int) $request->getData('id'))
+            ->where('id', $request->getDataInt('id') ?? 0)
             ->where('l11n/language', [$response->header->l11n->language, null])
             ->execute();
 
diff --git a/Docs/Help/en/attributes.md b/Docs/Help/en/attributes.md
index 38547b6..34fd78c 100644
--- a/Docs/Help/en/attributes.md
+++ b/Docs/Help/en/attributes.md
@@ -49,6 +49,7 @@ Suppliers can be put in categories for horizontal and vertical grouping. By defa
 | Attribute | Description | Internal default value |
 | --------- | ----------- | ---------------------- |
 | minimum_order | Minimum order amount required | |
+| bill_approval | Default group that can approve the bill | |
 
 ### Accounting
 
diff --git a/Theme/Backend/supplier-view.tpl.php b/Theme/Backend/supplier-view.tpl.php
index 36b931d..7870fdd 100644
--- a/Theme/Backend/supplier-view.tpl.php
+++ b/Theme/Backend/supplier-view.tpl.php
@@ -44,7 +44,7 @@ $languages    = ISO639Enum::getConstants();
 $supplier = $this->data['supplier'] ?? new NullSupplier();
 $isNew    = $supplier->id === 0;
 
-$supplierImage = $this->getData('supplierImage') ?? new NullMedia();
+$supplierImage = $this->data['supplierImage'] ?? new NullMedia();
 
 $supplierStatus = SupplierStatus::getConstants();
 
@@ -246,7 +246,7 @@ echo $this->data['nav']->render();
 
                     <section class="portlet hl-4">
                         <div class="portlet-body">
-                            <textarea class="undecorated"><?= $this->printTextarea($supplier->info); ?></textarea>
+                            <textarea class="undecorated" aria-label="Info"><?= $this->printTextarea($supplier->info); ?></textarea>
                         </div>
                     </section>
                     <?php endif; ?>
@@ -682,7 +682,7 @@ echo $this->data['nav']->render();
                             <div class="portlet-body">
                                 <input id="iPriceId" class="vh" name="id" type="number" data-tpl-text="/id" data-tpl-value="/id">
                                 <input id="iPriceSupplierId" class="vh" name="supplier" type="text" value="<?= $supplier->id; ?>">
-                                <input id="iPriceItemType" class="vh" name="type" type="text" value="<?= PriceType::PURCHASE; ?>">
+                                <input id="iPriceType" class="vh" name="type" type="text" value="<?= PriceType::PURCHASE; ?>">
 
                                 <div class="form-group">
                                     <label for="iPriceName"><?= $this->getHtml('Name'); ?></label>