Originally Posted by
quitecontrary
Thanks - not sure where I got JBO from

. The OW planner is just showing CPT-MRU as 1 sector. It's when I put in JNB-LHR that LHR flashes red. I might do this in F and I know BA don't do (or are ceasing MRU-LHR in F) so I'd have to route through JNB to get F.
If you double click on the triangle it will give you more information about the error. In your case you can't leave the country of origin more than once as per the rules of the xONEx tickets.
Also the system will allow you to put point to point entries that are not valid except via intermediary flights. So your CPT-MRU is valid but it would take 2 sectors to do it which you would find out when you started to enter the flights for each segment.