Yes, JPA doesn't let you do this (Hibernate does), and HEM recently decided to implement this part of the spec ;-) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3993560#3993560 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3993560