I have been trying to put together an ex-OSL DONE4 with the help of a travel agent and we're coming up with a pricing error that neither of us can figure out. First I thought it might be the South Africa rule, but we tried subbing HRE in place of JNB and no luck.

OSL-xDOH-NRT-BLR-NRT-SIN-HND-JFK-xLAX-ANC-xDFW-xDOH-JNB-xDOH-CMN-DOH-OSL

It's pricing only if I drop JNB or CMN on that itinerary, or alternately it's accepting CMN-xLHR-OSL on the tail end. Why isn't it allowing me to go back via DOH? Is it something about the distinction between Europe and the Middle East inside that region?

Similarly in the online tool I could price out almost the same itinerary, but had to go OSL-xHEL-NRT at the start since the tool won't allow QR on the first segment. It happily prices that including the CMN-DOH-OSL on the end.
(so that one that's pricing in the tool is OSL-xHEL-NRT-BLR-NRT-SIN-HND-JFK-xLAX-ANC-xDFW-xDOH-JNB-xDOH-CMN-DOH-OSL)