/**
* Return a unique reference like : GWJTHMZUN#2
*
* With multi-shipping, order reference are the same for all orders made with the same cart
* in this case this method suffix the order reference by a # and the order number
*
* @param $order_id
* @return
*/
public static function getUniqueReferenceOf($order_id)
{
$order = new JeproshopOrderModelOrder($id_order);
return $order->getUniqueReference();
}
