public EmployeeHistory createEmployeeHistory(Employee employee, Date lastModified)
	{
		try
		{
			begin();
			EmployeeHistory history = new EmployeeHistory(employee, lastModified);
			manager.persist(history);
			commit();
			
			return history;
		}
		catch(PersistenceException e)
		{
			e.printStackTrace();
			rollback();
			throw e;
		}
	}