How do I enter partner retro-credit correctly?

I had a 001 ticket with BA and QR flights and only the first flight on BA credited and it has been more than 2 week. When I go to the retrocredit form it asks me to enter the ETKT#, then on the next screen is says 'marketing carriers AA' - and I can't change that. How do I get the marketing carrier in there as 'BA' and 'QR'? Tried to submit it anyway with the BA and QR flight numbers and got the following error:
We are currently conducting system updates. Please come back and try again later.

Any help would be much appreciated!