There's no specific rule about needing AB number in booking but if you do encounter an overzealous lounge dragon It's really very simple.
1. Plug in PNR and Name on Finnair.com
2. Change FF number to AB number
3. Print BP
4. Once in lounge, repeat step 2 but changing back to QF number.
You could also phone up QF and ask for your AB number to be placed as FQTS (status recognition) and for your QF number to be FQTV (where the miles will credit to).
1. Plug in PNR and Name on Finnair.com
2. Change FF number to AB number
3. Print BP
4. Once in lounge, repeat step 2 but changing back to QF number.
You could also phone up QF and ask for your AB number to be placed as FQTS (status recognition) and for your QF number to be FQTV (where the miles will credit to).