This error occurs regardless of where the quote is - quotes or history. Now I did create a dummy prospect, copied the offending quote to it and deleted the original, and then copied it back to history under the original customer. What really has me confused is this quote was from June 2012 and they have been a customer since July 2012. Now I know I have run DataCare at least a few times since then and it is just showing up now. (This must have to do with my system).

But as I was saying to Bruce, I can't see that this hasn't occurred with someone else (other than the one other thread). Is this just a case of balancing complaints against work involved to fix it?

I agree with Bruce's solution - having the Prospect-to-Customer process update all Quotes (current and historical).

Thanks