Originally Posted by
sbiddle
There are no restrictions on paying for multi stop flights with APD - I've done this before and checking now this works fine.
Are you sure you're not including flights on a 3rd party carrier? Since you can only use APD for flights on NZ metal as as well as selected VA, SQ (to SIN), CX (to HKG) and UA (to SFO) flights.
Add CA to PEK to the list but I don't think you can do it with SQ.