Hi,
   1.  Is this using runtime or build-time enhancement?
   2.  May be related to this JIRA issue? [1]

           http://issues.apache.org/jira/browse/OPENJPA-659

   3. The code snippet below runs through fields of an instance to its dirty
embedded instance's dirty fields. Works as expected on latest OpenJPA. 
   
        @PostUpdate
        public void changed() {
                EntityManager em = OpenJPAPersistence.getEntityManager(this);
                PersistenceCapable pc = ImplHelper.toPersistenceCapable(this, 
em);
                OpenJPAStateManager sm = 
(OpenJPAStateManager)pc.pcGetStateManager();
                ClassMetaData meta = sm.getMetaData();
                BitSet dirty = sm.getDirty();
                for (int i=0; i<dirty.size(); i++) {
                        if (dirty.get(i)) {
                                if (meta.getField(i).isEmbedded()) {
                                        Object embedded = sm.fetch(i);
                                        PersistenceCapable epc = 
ImplHelper.toPersistenceCapable(embedded, em);
                                        OpenJPAStateManager esm = 
(OpenJPAStateManager)epc.pcGetStateManager();
                                        BitSet edirty = esm.getDirty();
                                        for (int j=0; j<edirty.size(); j++) {
                                                if (edirty.get(j))
                                                  
System.err.println(esm.getMetaData().getField(j));
                                        }
                                }
                        }
                }
                
        }


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