$_POST['stock_id'] = get_global_stock_item();
echo "<center>" . _("Item:"). " ";
-stock_costable_items_list('stock_id', $_POST['stock_id'], false, true);
+echo stock_costable_items_list('stock_id', $_POST['stock_id'], false, true);
echo "</center><hr>";
set_global_stock_item($_POST['stock_id']);