Hi there, I have following problem: I have abstract class, which is @MappedSuperclass and there I have (among others) attribute timestamp, which is common for all my entities. Now in entity class (which extends abstract class) I need to define composite primary key, but that timestamp attribute from abstract class should be part of composite primary key. How do I do that? Thanks a lot for help. Dalibor View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4237934#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...