Hey Tommy! I'm back from Italy and was finally able to try out your updated code today. The concurrencyMode error does appear to work! Yahoo! It only seems to appear if there are no other validation ("field") errors. But I think that is normal behavior. I don't think the ConcurrencyMode check runs until all the other validation completes.
Thank you very much for your help!
Oh, one more note: the error message appears twice, once formatted as a label followed again with text formatted as the error text. Is that what you intended?
Document has been saved by another user - Save has not been performed Document has been saved by another user - Save has not been performed