Fundraiser Credit Tracking when donor is transferred

Hi. This year we have been “turning” our donors almost every 3 months. Some we put in “eternal stewardship” where they need only minimum contact, but still need to stay in touch. Others we put on “hold” and in regular stewardship for 3 to 6 months until their pledge is paid off or maybe they requested no further donations for another 6 months, etc. The problem I am having is that when I transfer a donor out of the Current Fundraiser's portfolio and make her the “Former Fundraiser” IF a donation is made by this donor, the system will not credit the correct fundraiser or any fundraiser if not assigned to a “Current Fundraiser”. I need a way to “Tag” donors who had “Former Fundraisers” for a period of 6 months, because if a donor gives a gift then that Former Fundraiser is to receive the credit for that gift. I have tried a Query in order to create a “Business Rule” but that doesn't work either, because I have to “export” the information to get both the Current Fundraiser and the Former Fundraiser.

Has anyone come across this situation before? How did you “tag” the donor's record in order so that the database entry team realized that they needed to “look for a former Fundraiser” before credit was given for the gift? Did you use a business rule? If so, how did you structure the query?

Did you run a specific report? If so, what report and how did you structure?

Thank you for your help and ideas.

Tiki