Thanks for your reply,perhaps it's the terminology but the OW web site says........

"You can take as many flights as you like with your oneworld Visit Asia visitor pass (minimum two flights). You need only confirm the first sector of your itinerary when you make your booking. You have the flexibility to select the dates/flight times of any other sectors (subject to availability), provided you ask for the flights to be left "open-dated."

My understanding is a flight is one take off and landing therefore a return is two flights?