As far as I know secondary tables have to share primary keys. You could use @OneToOne instead. Regards Felix View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4038651#4038651 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4038651