I've got a one-to-many relationship in one of my beans and have never had any trouble. This is from my entity bean: List<Request> requests = new ArrayList<Request>(); | | @OneToMany | public List<Request> getRequests() | { | return requests; | } | public void setRequests(List<Request> requests) | { | this.requests = requests; | } If you are having to perform a merge() then that's because you are not using a seam managed persistence context. I am using an injected persistence context in my session bean: @In | EntityManager entityManager This is then configured in components.xml and persistence.xml. I'm still experimenting with the 1-many relationship in terms of how changes are persisted when items are added and removed, I can get it to work quite easily but I'm sure there's a better way than the one I'm using. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4035806#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...