diff --git a/Models/BillElementMapper.php b/Models/BillElementMapper.php
index 6a112b7..f397608 100755
--- a/Models/BillElementMapper.php
+++ b/Models/BillElementMapper.php
@@ -42,7 +42,7 @@ final class BillElementMapper extends DataMapperFactory
         'billing_bill_element_item_number'               => ['name' => 'billing_bill_element_item_number',      'type' => 'string',    'internal' => 'itemNumber'],
         'billing_bill_element_item_name'                 => ['name' => 'billing_bill_element_item_name',      'type' => 'string',    'internal' => 'itemName'],
         'billing_bill_element_item_desc'                 => ['name' => 'billing_bill_element_item_desc',      'type' => 'string',    'internal' => 'itemDescription'],
-        'billing_bill_element_quantity'                  => ['name' => 'billing_bill_element_quantity',      'type' => 'int',    'internal' => 'quantity'],
+        'billing_bill_element_quantity'                  => ['name' => 'billing_bill_element_quantity',      'type' => 'int',    'internal' => 'quantity', 'private' => true],
 
         'billing_bill_element_single_netlistprice'       => ['name' => 'billing_bill_element_single_netlistprice',      'type' => 'Serializable',    'internal' => 'singleListPriceNet'],
         'billing_bill_element_single_grosslistprice'     => ['name' => 'billing_bill_element_single_grosslistprice',      'type' => 'Serializable',    'internal' => 'singleListPriceGross'],
diff --git a/tests/Models/BillElementTest.php b/tests/Models/BillElementTest.php
index be06730..429ed9f 100755
--- a/tests/Models/BillElementTest.php
+++ b/tests/Models/BillElementTest.php
@@ -38,10 +38,10 @@ final class BillElementTest extends \PHPUnit\Framework\TestCase
     public function testDefault() : void
     {
         self::assertEquals(0, $this->element->id);
-        self::assertInstanceOf('\phpOMS\Localization\Money', $this->element->singleSalesPriceNet);
-        self::assertInstanceOf('\phpOMS\Localization\Money', $this->element->totalSalesPriceNet);
-        self::assertInstanceOf('\phpOMS\Localization\Money', $this->element->singlePurchasePriceNet);
-        self::assertInstanceOf('\phpOMS\Localization\Money', $this->element->totalPurchasePriceNet);
+        self::assertInstanceOf('\phpOMS\Stdlib\Base\IntFloat', $this->element->singleSalesPriceNet);
+        self::assertInstanceOf('\phpOMS\Stdlib\Base\IntFloat', $this->element->totalSalesPriceNet);
+        self::assertInstanceOf('\phpOMS\Stdlib\Base\IntFloat', $this->element->singlePurchasePriceNet);
+        self::assertInstanceOf('\phpOMS\Stdlib\Base\IntFloat', $this->element->totalPurchasePriceNet);
     }
 
     /**
diff --git a/tests/Models/BillTest.php b/tests/Models/BillTest.php
index 568c958..715d66c 100755
--- a/tests/Models/BillTest.php
+++ b/tests/Models/BillTest.php
@@ -117,17 +117,6 @@ final class BillTest extends \PHPUnit\Framework\TestCase
         self::assertEquals(ISO4217CharEnum::_USD, $this->bill->getCurrency());
     }
 
-    /**
-     * @covers Modules\Billing\Models\Bill
-     * @group module
-     */
-    public function testMediaInputOutput() : void
-    {
-        $this->bill->addMedia($temp = new Media());
-        self::assertCount(1, $this->bill->getMedia());
-        self::assertEquals([$temp], $this->bill->getMediaByType());
-    }
-
     /**
      * @covers Modules\Billing\Models\Bill
      * @group module