Tedhl,

In case you're not able to get BA to credit the flight and still want CX credit you need to talk to Finnair wherever you do business with them. Since your original flights were with them, they will be the ones to sort out any crediting issues.

I had a very similar problem to yours with my 4x100k bonus except that the inept AA folks took too much credit for all my AY flights even though I only sent them one AY ticket.

In any case the procedure was to call AA and have them erase the flights I didn't want credited (not a problem in your case). Then Finnair will check to see which flights have been credited and then send a letter to the program you want credit on.

In my case, I dealt with Finnair in New York where Mike Dunham was incredibly helpful to me. He researched it for me and sent out letters to the other three frequent flyer programs. As a result, BA and CX posted.