diff --git a/classes/CartRule.php b/classes/CartRule.php
index 98153d8ec..54fc400c5 100644
--- a/classes/CartRule.php
+++ b/classes/CartRule.php
@@ -59,12 +59,9 @@ class CartRuleCore extends ObjectModel
 
 	public static $definition = array(
 		'table' => 'cart_rule',
-		'identifier' => 'id_cart_rule',
+		'primary' => 'id_cart_rule',
 	);
 
-	protected $table = 'cart_rule';
-	protected $identifier = 'id_cart_rule';
-
  	protected $fieldsRequired = array('date_from', 'date_to');
  	protected $fieldsSize = array('code' => 254, 'description' => 65534);
  	protected $fieldsValidate = array(
diff --git a/classes/order/OrderInvoice.php b/classes/order/OrderInvoice.php
index 70f7fa399..c9d4b6e11 100644
--- a/classes/order/OrderInvoice.php
+++ b/classes/order/OrderInvoice.php
@@ -71,7 +71,7 @@ class OrderInvoiceCore extends ObjectModel
 
 	public static $definition = array(
 		'table' => 'order_invoice',
-		'identifier' => 'id_order_invoice',
+		'primary' => 'id_order_invoice',
 	);
 
 	public function getFields()
diff --git a/classes/stock/Stock.php b/classes/stock/Stock.php
index 434128e4a..fd8b32a69 100644
--- a/classes/stock/Stock.php
+++ b/classes/stock/Stock.php
@@ -84,7 +84,7 @@ class StockCore extends ObjectModel
 
 	public static $definition = array(
 		'table' => 'stock',
-		'identifier' => 'id_stock',
+		'primary' => 'id_stock',
 	);
 
 	public function getFields()