diff --git a/Controller/ApiController.php b/Controller/ApiController.php
index 787e531..4bd91e0 100755
--- a/Controller/ApiController.php
+++ b/Controller/ApiController.php
@@ -157,7 +157,7 @@ final class ApiController extends Controller
         $this->createModel($request->header->account, $contactElement, ContactElementMapper::class, 'supplier-contactElement', $request->getOrigin());
         $this->createModelRelation(
             $request->header->account,
-            (int) $request->getData('supplier'),
+            (int) $request->getData('account'),
             $contactElement->getId(),
         SupplierMapper::class, 'contactElements', '', $request->getOrigin());
         $this->fillJsonResponse($request, $response, NotificationLevel::OK, 'Contact Element', 'Contact element successfully created', $contactElement);
diff --git a/tests/Models/NullSupplier.php b/tests/Models/NullSupplier.php
deleted file mode 100644
index a2270d4..0000000
--- a/tests/Models/NullSupplier.php
+++ /dev/null
@@ -1,42 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 8.0
- *
- * @package   tests
- * @copyright Dennis Eichhorn
- * @license   OMS License 1.0
- * @version   1.0.0
- * @link      https://orange-management.org
- */
-declare(strict_types=1);
-
-namespace Modules\SupplierManagement\tests\Models;
-
-use Modules\SupplierManagement\Models\NullSupplier;
-
-/**
- * @internal
- */
-final class Null extends \PHPUnit\Framework\TestCase
-{
-    /**
-     * @covers Modules\SupplierManagement\Models\NullSupplier
-     * @group framework
-     */
-    public function testNull() : void
-    {
-        self::assertInstanceOf('\Modules\SupplierManagement\Models\Supplier', new NullSupplier());
-    }
-
-    /**
-     * @covers Modules\SupplierManagement\Models\NullSupplier
-     * @group framework
-     */
-    public function testId() : void
-    {
-        $null = new NullSupplier(2);
-        self::assertEquals(2, $null->getId());
-    }
-}
diff --git a/tests/Models/NullSupplierAttribute.php b/tests/Models/NullSupplierAttribute.php
deleted file mode 100644
index f3219f7..0000000
--- a/tests/Models/NullSupplierAttribute.php
+++ /dev/null
@@ -1,42 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 8.0
- *
- * @package   tests
- * @copyright Dennis Eichhorn
- * @license   OMS License 1.0
- * @version   1.0.0
- * @link      https://orange-management.org
- */
-declare(strict_types=1);
-
-namespace Modules\SupplierManagement\tests\Models;
-
-use Modules\SupplierManagement\Models\NullSupplierAttribute;
-
-/**
- * @internal
- */
-final class Null extends \PHPUnit\Framework\TestCase
-{
-    /**
-     * @covers Modules\SupplierManagement\Models\NullSupplierAttribute
-     * @group framework
-     */
-    public function testNull() : void
-    {
-        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttribute', new NullSupplierAttribute());
-    }
-
-    /**
-     * @covers Modules\SupplierManagement\Models\NullSupplierAttribute
-     * @group framework
-     */
-    public function testId() : void
-    {
-        $null = new NullSupplierAttribute(2);
-        self::assertEquals(2, $null->getId());
-    }
-}
diff --git a/tests/Models/NullSupplierAttributeType.php b/tests/Models/NullSupplierAttributeType.php
deleted file mode 100644
index 441cccd..0000000
--- a/tests/Models/NullSupplierAttributeType.php
+++ /dev/null
@@ -1,42 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 8.0
- *
- * @package   tests
- * @copyright Dennis Eichhorn
- * @license   OMS License 1.0
- * @version   1.0.0
- * @link      https://orange-management.org
- */
-declare(strict_types=1);
-
-namespace Modules\SupplierManagement\tests\Models;
-
-use Modules\SupplierManagement\Models\NullSupplierAttributeType;
-
-/**
- * @internal
- */
-final class Null extends \PHPUnit\Framework\TestCase
-{
-    /**
-     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeType
-     * @group framework
-     */
-    public function testNull() : void
-    {
-        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttributeType', new NullSupplierAttributeType());
-    }
-
-    /**
-     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeType
-     * @group framework
-     */
-    public function testId() : void
-    {
-        $null = new NullSupplierAttributeType(2);
-        self::assertEquals(2, $null->getId());
-    }
-}
diff --git a/tests/Models/NullSupplierAttributeTypeL11n.php b/tests/Models/NullSupplierAttributeTypeL11n.php
deleted file mode 100644
index c94ce63..0000000
--- a/tests/Models/NullSupplierAttributeTypeL11n.php
+++ /dev/null
@@ -1,42 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 8.0
- *
- * @package   tests
- * @copyright Dennis Eichhorn
- * @license   OMS License 1.0
- * @version   1.0.0
- * @link      https://orange-management.org
- */
-declare(strict_types=1);
-
-namespace Modules\SupplierManagement\tests\Models;
-
-use Modules\SupplierManagement\Models\NullSupplierAttributeTypeL11n;
-
-/**
- * @internal
- */
-final class Null extends \PHPUnit\Framework\TestCase
-{
-    /**
-     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeTypeL11n
-     * @group framework
-     */
-    public function testNull() : void
-    {
-        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttributeTypeL11n', new NullSupplierAttributeTypeL11n());
-    }
-
-    /**
-     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeTypeL11n
-     * @group framework
-     */
-    public function testId() : void
-    {
-        $null = new NullSupplierAttributeTypeL11n(2);
-        self::assertEquals(2, $null->getId());
-    }
-}
diff --git a/tests/Models/NullSupplierAttributeValue.php b/tests/Models/NullSupplierAttributeValue.php
deleted file mode 100644
index 56ab204..0000000
--- a/tests/Models/NullSupplierAttributeValue.php
+++ /dev/null
@@ -1,42 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 8.0
- *
- * @package   tests
- * @copyright Dennis Eichhorn
- * @license   OMS License 1.0
- * @version   1.0.0
- * @link      https://orange-management.org
- */
-declare(strict_types=1);
-
-namespace Modules\SupplierManagement\tests\Models;
-
-use Modules\SupplierManagement\Models\NullSupplierAttributeValue;
-
-/**
- * @internal
- */
-final class Null extends \PHPUnit\Framework\TestCase
-{
-    /**
-     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeValue
-     * @group framework
-     */
-    public function testNull() : void
-    {
-        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttributeValue', new NullSupplierAttributeValue());
-    }
-
-    /**
-     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeValue
-     * @group framework
-     */
-    public function testId() : void
-    {
-        $null = new NullSupplierAttributeValue(2);
-        self::assertEquals(2, $null->getId());
-    }
-}