I just changed a HKT-DOH-DWC (J/F tix) to HKT-DOH-KWI all on QR metal & done about 10 days out fro the travel date (because its QR metal there is no 24/72 hour limitation on re-booking). I decided to find my own way from KWI-AUH (net on-cost to me=10k EY miles & about £50 for J tix o/way, which is fine by me). The return leg I left as, DWC-DOH-HKT for now, which is in about 8 weeks time.
I was assured that the return leg is "good" even though it's now open-jaw,
although having got the e-tix through I now cannot "manage my booking". Mmm??