In this case you never try and re-persist kfz1. If you did you'd probably get the same error here as well. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4036875#4036875 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4036875