diff --git a/.github/user_bug_report.md b/.github/user_bug_report.md
index 9e5f2a5..4b92a8e 100755
--- a/.github/user_bug_report.md
+++ b/.github/user_bug_report.md
@@ -8,9 +8,11 @@ assignees: ''
 ---
 
 # Bug Description
+
 A clear and concise description of what the bug is.
 
 # How to Reproduce
+
 Steps to reproduce the behavior:
 
 1. Go to '...'
@@ -19,16 +21,20 @@ Steps to reproduce the behavior:
 4. See error
 
 # Expected Behavior
+
 A clear and concise description of what you expected to happen.
 
 # Screenshots
+
 If applicable, add screenshots to help explain your problem.
 
 # System Information
- - System: [e.g. PC or iPhone11, ...]
- - OS: [e.g. iOS]
- - Browser [e.g. chrome, safari]
- - KarakaVersion [e.g. 22]
+
+- System: [e.g. PC or iPhone11, ...]
+- OS: [e.g. iOS]
+- Browser [e.g. chrome, safari]
+- KarakaVersion [e.g. 22]
 
 # Additional Information
+
 Add any other context about the problem here.
diff --git a/Controller/ApiController.php b/Controller/ApiController.php
index 7fb6848..29dfd61 100755
--- a/Controller/ApiController.php
+++ b/Controller/ApiController.php
@@ -288,7 +288,7 @@ final class ApiController extends Controller
     private function validateItemCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['number'] = empty($request->getData('number')))) {
+        if (($val['number'] = !$request->hasData('number'))) {
             return $val;
         }
 
@@ -361,7 +361,7 @@ final class ApiController extends Controller
     private function validateItemPriceCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['price'] = empty($request->getData('price')))
+        if (($val['price'] = !$request->hasData('price'))
             || ($val['currency'] = !ISO4217CharEnum::isValidValue($request->getData('currency')))
         ) {
             return $val;
@@ -439,9 +439,9 @@ final class ApiController extends Controller
     private function validateItemAttributeCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['type'] = empty($request->getData('type')))
-            || ($val['value'] = (empty($request->getData('value')) && empty($request->getData('custom'))))
-            || ($val['item'] = empty($request->getData('item')))
+        if (($val['type'] = !$request->hasData('type'))
+            || ($val['value'] = (!$request->hasData('value') && !$request->hasData('custom')))
+            || ($val['item'] = !$request->hasData('item'))
         ) {
             return $val;
         }
@@ -509,8 +509,8 @@ final class ApiController extends Controller
     private function validateItemAttributeTypeL11nCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['title'] = empty($request->getData('title')))
-            || ($val['type'] = empty($request->getData('type')))
+        if (($val['title'] = !$request->hasData('title'))
+            || ($val['type'] = !$request->hasData('type'))
         ) {
             return $val;
         }
@@ -580,8 +580,8 @@ final class ApiController extends Controller
     private function validateItemAttributeTypeCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['title'] = empty($request->getData('title')))
-            || ($val['name'] = empty($request->getData('name')))
+        if (($val['title'] = !$request->hasData('title'))
+            || ($val['name'] = !$request->hasData('name'))
         ) {
             return $val;
         }
@@ -665,8 +665,8 @@ final class ApiController extends Controller
     private function validateItemAttributeValueCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['type'] = empty($request->getData('type')))
-            || ($val['value'] = empty($request->getData('value')))
+        if (($val['type'] = !$request->hasData('type'))
+            || ($val['value'] = !$request->hasData('value'))
         ) {
             return $val;
         }
@@ -734,8 +734,8 @@ final class ApiController extends Controller
     private function validateItemAttributeValueL11nCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['title'] = empty($request->getData('title')))
-            || ($val['value'] = empty($request->getData('value')))
+        if (($val['title'] = !$request->hasData('title'))
+            || ($val['value'] = !$request->hasData('value'))
         ) {
             return $val;
         }
@@ -800,7 +800,7 @@ final class ApiController extends Controller
     private function validateItemL11nTypeCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['title'] = empty($request->getData('title')))) {
+        if (($val['title'] = !$request->hasData('title'))) {
             return $val;
         }
 
@@ -863,7 +863,7 @@ final class ApiController extends Controller
     private function validateItemRelationTypeCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['title'] = empty($request->getData('title')))) {
+        if (($val['title'] = !$request->hasData('title'))) {
             return $val;
         }
 
@@ -931,9 +931,9 @@ final class ApiController extends Controller
     private function validateItemL11nCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['item'] = empty($request->getData('item')))
-            || ($val['type'] = empty($request->getData('type')))
-            || ($val['description'] = empty($request->getData('description')))
+        if (($val['item'] = !$request->hasData('item'))
+            || ($val['type'] = !$request->hasData('type'))
+            || ($val['description'] = !$request->hasData('description'))
         ) {
             return $val;
         }
@@ -1025,7 +1025,7 @@ final class ApiController extends Controller
     private function validateFileCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['item'] = empty($request->getData('item')))
+        if (($val['item'] = !$request->hasData('item'))
         ) {
             return $val;
         }
@@ -1083,7 +1083,7 @@ final class ApiController extends Controller
     private function validateNoteCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['id'] = empty($request->getData('id')))
+        if (($val['id'] = !$request->hasData('id'))
         ) {
             return $val;
         }
diff --git a/Models/Item.php b/Models/Item.php
index 81ecca3..02ff5b7 100755
--- a/Models/Item.php
+++ b/Models/Item.php
@@ -144,6 +144,12 @@ class Item implements \JsonSerializable
      */
     public function addL11n(ItemL11n $l11n) : void
     {
+        foreach ($this->l11n as $l11n) {
+            if ($l11n->type->title === $l11n->type->title) {
+                return;
+            }
+        }
+
         $this->l11n[] = $l11n;
     }
 
diff --git a/Models/ItemAttributeType.php b/Models/ItemAttributeType.php
index 556adb8..ff6e931 100755
--- a/Models/ItemAttributeType.php
+++ b/Models/ItemAttributeType.php
@@ -59,8 +59,20 @@ class ItemAttributeType implements \JsonSerializable
      */
     public bool $custom = false;
 
+    /**
+     * Validation pattern for the value
+     *
+     * @var string
+     * @since 1.0.0
+     */
     public string $validationPattern = '';
 
+    /**
+     * Is the attribute required
+     *
+     * @var bool
+     * @since 1.0.0
+     */
     public bool $isRequired = false;
 
     /**
@@ -74,7 +86,8 @@ class ItemAttributeType implements \JsonSerializable
     /**
      * Localization
      *
-     * @var BaseStringL11n
+     * @var string|BaseStringL11n
+     * @since 1.0.0
      */
     private string | BaseStringL11n $l11n = '';
 
@@ -82,6 +95,7 @@ class ItemAttributeType implements \JsonSerializable
      * Possible default attribute values
      *
      * @var array
+     * @since 1.0.0
      */
     private array $defaults = [];
 
@@ -117,6 +131,15 @@ class ItemAttributeType implements \JsonSerializable
         return $this->id;
     }
 
+    /**
+     * Get default value by value
+     *
+     * @param mixed $value Value
+     *
+     * @return ItemAttributeValue
+     *
+     * @since 1.0.0
+     */
     public function getDefaultByValue(mixed $value) : ItemAttributeValue
     {
         foreach ($this->defaults as $default) {
diff --git a/tests/Controller/ApiControllerTest.php b/tests/Controller/ApiControllerTest.php
index 0c1e859..8e2d753 100755
--- a/tests/Controller/ApiControllerTest.php
+++ b/tests/Controller/ApiControllerTest.php
@@ -69,7 +69,7 @@ final class ApiControllerTest extends \PHPUnit\Framework\TestCase
 
         $permission = new AccountPermission();
         $permission->setUnit(1);
-        $permission->setApp('backend');
+        $permission->setApp(2);
         $permission->setPermission(
             PermissionType::READ
             | PermissionType::CREATE