I really don't know what else to say via the forum past taking the sample that you gave me and trying to point you in the right direction here.  This has more to do with how you dsign your application versus being anything related to StrataFrame.

You must take business logic and design into account here which includes the possibility that you do not have records in one BO while they are in the other.  Now, SF will take a no record situation into account automatically as the bindings get removed in this case to prevent an error.  But from what I can tell, and from the sample that you provided for me to look at, I don't see anything that is SF related.  You would have the exact same issue if you were using data adapters and standard .NET data binding.  I don't of any other way to say this or explain this.

To really help you understand the overall issues that you have within your application are more of a consulting and training issue versus any type of issue with StrataFrame.  The forum is not a good tool for this and is why we provide training classes and the occasional consulting (when we have the time).  But past creating some sample that more accuratly depicts your problem, I am at a loss as to what to add to my comments here.  Sorry