I think you need to look to Hibernate for these issue. Seam isn't going to get involved with ORM details. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4020912#4020912 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4020912