e.setValue("echanged");
e.getRelation().setValue("rchanged");
em = emf.createEntityManager();
em.getTransaction().begin();
EmbeddedIdEntity me = (EmbeddedIdEntity) em.mergeAll(e,
e.getRelation())[0];
assertTrue(me != e);
assertNotNull(me.getRelation());
assertTrue(me.getRelation() != e.getRelation());
assertEquals("echanged", me.getValue());