Hi, you mean you want to remove the child from all buyers, but keep the child? Then your code should be (last two lines are changed): Vendor child = this.manager.getReference(Vendor.class, vendorid ); | | Collection listParents = child.getBuyers(); | Iterator iteratorParents = listParents.iterator(); | while (iteratorParents.hasNext() == true) | { | Buyer parentForChild = iteratorParents.next(); | parentForChild.getVendors().remove(child); | } | | //remove ALL buyers from child: | listParents.removeAll(); | | //Now SAVE the child: | this.manager.persist(child); Hope this helps Wolfgang View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4190397#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...