@Override
public void sub(
final PersistentAbsQuantity minuend,
final PersistentAbsQuantity subtrahend,
final Invoker invoker)
throws PersistenceException {
final java.sql.Date now = new java.sql.Date(new java.util.Date().getTime());
final PersistentSubCommand command = model.meta.SubCommand.createSubCommand(now, now);
command.setMinuend(minuend);
command.setSubtrahend(subtrahend);
command.setInvoker(invoker);
command.setCommandReceiver(getThis());
model.meta.CommandCoordinator.getTheCommandCoordinator().coordinate(command);
}