You didn't do anything wrong, code 8708 is just a message to alert you that the "view" of the data presently on your screen was not a perfect representation of the data actually in the database at that moment because some other user, or some other screen, or some other background process changed it since the moment you first opened that record. You should see this very rarely, and I may have a minor bug to chase down. If you can reproduce the message at-will, please let me know the steps.