Originally Posted by
wazow
Not really defending an incompetence, but probably your quite non-standard connection has confused the agents. It did not cross their mind that you are flying back to France (and may be you did not actually told the FAs what is your exact routing, they just assumed domestic -- I would expect these people to know well the rules in Oslo after all)
I think, especially given the sh*tload of trouble OP had with actually getting his ticket and all the extra staff involved there, that staff in HAM should have been well-aware of his routing. And no, we Norwegians haven't invaded and annexed France recently... Last attempt was about 1200 years ago.