+ if (is_reference_already_there($_SESSION['supp_trans']->supplier_id, $_POST['supp_reference'], $_SESSION['supp_trans']->trans_no))
+ { /*Transaction reference already entered */
+ display_error(_("This invoice number has already been entered. It cannot be entered again.") . " (" . $_POST['supp_reference'] . ")");
+ set_focus('supp_reference');
+ return false;
+ }
+
+ if (!$SysPrefs->allow_negative_stock()) {
+ foreach ($_SESSION['supp_trans']->grn_items as $n => $item) {
+ if (is_inventory_item($item->item_code))
+ {
+ if (check_negative_stock($item->item_code, -$item->this_quantity_inv, null, $_SESSION['supp_trans']->tran_date))
+ {
+ $stock = get_item($item->item_code);
+ display_error(_("The return cannot be processed because there is an insufficient quantity for item:") .
+ " " . $stock['stock_id'] . " - " . $stock['description'] . " - " .
+ _("Quantity On Hand") . " = " . number_format2(get_qoh_on_date($stock['stock_id'], null,
+ $_SESSION['supp_trans']->tran_date), get_qty_dec($stock['stock_id'])));
+ return false;
+ }
+ }
+ }
+ }