* from the second parameter instance.
* @param o the object to check
*/
private void singleFieldIdentity(AbstractPCPointSingleField o) {
assertPersistenceCapable(o);
SingleFieldIdentity sfi = (SingleFieldIdentity) makePersistent(o);
PersistenceCapable pc = (PersistenceCapable) o;
ObjectIdFieldConsumer objectIdFieldConsumer =
new ObjectIdFieldConsumer();
pc.jdoCopyKeyFieldsFromObjectId(objectIdFieldConsumer, sfi);
if (!objectIdFieldConsumer.equals(sfi)) {