I know I had a number of changes that had to be made on mine because they we're allowed. I was told no open jaws at all. However, some minor things seem allowed on one Skyteam carrier, but not on others. Just don't count on anything until you have the tickets in your hand.

I recently changed my flights, and it appears to be an e-ticket now, instead of a paper ticket. I'm in Asia now, and it shows up online as e-ticketed. That would be much nicer than having to send the paper tickets in each time.