Kevin,
I was just going to start with the Business Rules business and I decided to see how the fix for required fields works. Guess what ... It did not. So,
I checked the code you proposed and I found it is exactly the same code as in the mmBusinessRule object. So, I dont see how it will fix the problem if it does not fix the problem /if you know what I mean <s>/.
BTW did you actualy tried to reproduce the error? It is the very same scenario, as I described before. I traced the code and I don't see obvious reason not to work.

Regards,
Nick