{
if ($order->find_cart_item($new_item))
display_error(_("For Part :") . $new_item . " " . "This item is already on this document. You can change the quantity on the existing line if necessary.");
else
{
if ($order->find_cart_item($new_item))
display_error(_("For Part :") . $new_item . " " . "This item is already on this document. You can change the quantity on the existing line if necessary.");
else