one-to-many from the subclass to the root class? why not put the ID in the superclass? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4107620#4107620 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4107620