private void createDeliveryType(int number, String description) {
   DeliveryType type = new DeliveryType();
   type.setNumber(number);
   type.setDescription(description);
   XPersistence.getManager().persist(type);
   XPersistence.commit();
 }
 private void deleteDeliveryType(int number) {
   DeliveryType type = XPersistence.getManager().find(DeliveryType.class, number);
   XPersistence.getManager().remove(type);
   XPersistence.commit();
 }