I'm booking an AONEWC4 through Harare (still getting great service from them) and they tell me that if I leave any segments open they cannot issue an e-ticket. I prefer an e-ticket since it will save me having to go into Harare to pick up a paper ticket and I can just do a quick turnaround at HRE.

It's not a big deal since changes are free, but is this a general rule?