Easily done., you just need a class in between: Consultant [1] ->[N]ServiceInformation[N]<-Learner View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4156158#4156158 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4156158