I forgot to update this. It was my bad (doh). What has happening was that the BO was being saved by a navigation component (allowing the BO to be navigated using a listbox). That component was designed to handle the case when the user clicked on another item in the list without saving first. In that case it would prompt the use to save/undo the changes or cancel the navigation. However, I wasn't checking on the broken rules here, so I'd get the prompt. I added a check for broken rules and it is working. I'd coded the component a while ago and forgot that I had that logic...oops

Hehe, no problem   And I was on vacation, so you didn't get much help from me while I was gone...