I donīt get it either. But two months ago i booked an award ticket LHR-ORD-CMH-DFW-MEX-ORD-LHR with a stop over in CMH. At first I had trouble with the agent at a ticket counter in Mexico, because she said I was braking a rule (reservation was made without a problem). The famous rule of only being able to get a stop over in either MIA, ORD or DFW. But after a little chatting, she noticed that the system aloud her to continue, so she sent it to ADVANTAGE Desk in Lima, Peru for authorization and told me that if ADVANTAGE authorize it, it was OK. And they did, so I had no problem and she had no problem. So sometimes it is more of how the ADVANTAGE supervisorīs mood is and not a matter of rules, jejeje.