Originally Posted by
GCIFlyer
Yes that's right - they will redeposit your Tokyo leg Avios and immediately re-debit one half (to take account of the companion voucher); you will end up with an itinerary on one booking reference but the outbound and inbound will be different ticket numbers
It is my experience that you will continue to have two booking references (one outbound and one inbound), but your voucher will be applied to both.