private static void processDelete(String type, String id) {
   if ("LineItem".equals(type)) {
     LineItem lineitem = LineItem.findById(new Long(id));
     lineitem.purchaseOrder.lineItems.remove(lineitem);
     lineitem.delete();
     setCurrentUseCaseName("Line Item deleted");
   } else if ("Order".equals(type)) {
     PurchaseOrder order = PurchaseOrder.findById(new Long(id));
     order.customer.purchaseOrders.remove(order);
     order.delete();
     setCurrentUseCaseName("Order deleted");
   }
 }