I feel like this is the best place to post this, but why is it not possible to book a Multi-City trip SIN-DYG-PEK-SIN on AP's website? It's perfectly possible on united, and I can search the individual segments on AP just fine, but when I try to put it as one search it gives me a "Your requested itinerary is invalid and cannot be booked on one reward." error. SIN-CTU-DYG-PEK definitely wouldn't break the MPM of SIN-PEK, the detour is marginal.

Am I missing something here?