It is the same as wanting to visit both Europe and Australia on the same OWE.You can't do this on a xONE3. Even though you could fly,e.g. "nonstop" LHR-SYD on QF 32 and no Asian airport code will ever occur in your itinerary, you still have to pay for Asia as a continent as they have to stop for fuel in SIN (and because this is the rule: "Travel between Europe and SWP is considered travelling through three continents Europe-Asia-SWP".)
Sorry,if this does not exactly relate to your question,but just to give another example.