- if (!is_new_reference($_SESSION['supp_trans']->reference, ST_SUPPINVOICE, $_SESSION['supp_trans']->trans_no))
- {
- display_error(_("The entered reference is already in use."));
- set_focus('reference');
- return false;
- }
-
- if (!$Refs->is_valid($_SESSION['supp_trans']->supp_reference))
- {
- display_error(_("You must enter a supplier's invoice reference."));
- set_focus('supp_reference');
- return false;
- }
-