Originally Posted by eigenvector

My opinion - which, to be clear, is speculative - is that if Aeroplan sees "R" they won't credit anything no matter what you tell them. They don't know, and don't care to learn, about how GPUs work on UA. Your best chance of success is asking UA to un-credit the flights and re-credit as "W".

I have the reverse problem once - AC credited a booking I upgraded from K to P (by just purchasing the higher fare) as K. UA MP fixed it once I provided the ticket receipt showing "P". But it seems like you don't have that and it's notoriously difficult to talk to an actual person at Aeroplan about these issues. So that's why I suggest dealing with UA.