Hi, I have Order and Item classes. In Order class: @OneToMany(mappedBy="order") public Collection items = new ArrayList(); In Item class: @Id @Column(name = "orderid", insertable = false, updatable = false) public Long orderid; @ManyToOne @JoinColumn(name = "orderid") public Order order; When I deploy my app to jboss 4.0.4 GA. It throws the following error: Repeated column in mapping for entity: Item column: orderid (should be mapped with insert="false" update="false") What's wrong with my code? Thanks, View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3990534#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...