Hi, the problem is that i don't have the permission to make changes on the DB because it's a LIVE/Production DB. So problems with releases/changes and so on. I tried to access now my attributs via @NamedQuery like this: SELECT r.roadPK.origin.iata,r.roadPK.destination.iata, r.availabilityMethod FROM Road r but there I got a compiler error: Caused by: org.hibernate.HibernateException: Errors in named queries: Road.listAll | at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:397) | at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1327) | at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867) | at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669) | ... 75 more By testing with SELECT r.roadPK.origin, r.roadPK.destination,r.availabilityMethod FROM Route r i didn't get any error but also any output. lol Like i told it before, with SELECT r.availabilityMethod FROM Route r is no problem! So logically I can access my attributs via r.roadPK.origin.iata but I get there the error! So I think that my mapping is wrong. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4227445#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...