problems with amending a BD number
 

I have a BD booking which became a BA one. My BD number is the one which I quoted but using Manage My Booking on the BA site it won't let me change it. Is the only way to do it at the airport? Otherwise I can't get any benefit for it.

Have you tried using Manage My Booking on the FinnAir website? That's the recommended way to swap between CX and BAEC numbers on a BA booking, if you have status with one (for seat selection) but want to credit the miles to the other. Possibly it'll work for you to swap between BD and BAEC numbers, worth a try anyway!

I have the same problem - doesn't work... Unless you call BA.