Hi All - could I check something with you?

A very helpful lady in the BA Gold call centre is trying to help me book my DONE4, but ticketing have come back and said tha the itinerary isn't valid:

OSL-LHR-HKG-SYD-NOU-SYD-MEL-DPS-KUL-KIX-HNL-LAX-MIA-BOS-PHX-LHR-OSL

The issue seems to be the Hong Kong leg - ticketing are saying that counts as me going to Asia twice, but I understood from the fare rules that you were allowed a stop in Asia on the way to South Pacific sector. Is the issue that I was stopping in HK for 2 days? Is it that I need to spend less than 24 hours in Hong Kong for the route to be valid, or are they just wrong?

I've asked them to look at BA15 from LHR-SYD instead as technically it's a single flight (albeit with a touch down in SIN) as an alternative. If I do that then I guess I could insert Hong Kong between KUL & KIX if I don't want to lose my hong kong stop? Or am I barking up the wrong tree?

Thanks in advance for any advice!