This is unsupported. See also EJB3 Java Persistence API 2.1.4 5th paragraph. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4003193#4003193 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4003193