Originally Posted by
etiene
I've seen it said that to book an award itinerary, a similar cash fare has to be available - but I can't remember if that's true at BA, or if it applies to multi-carrier rewards...
If your itinerary has a comparable cash fare on ITA Matrix it should help agents to identify splitting point of the itinerary and performing tax calculation faster (manual compiling 2 separate tickets together).
Being based in HK, recently on a good day the local call centre team might be able to give you the tax amount and do ticket issuance in the same call.