Originally Posted by
golfmad
It's fine and a single ticket is fine. You'll get both sets of points. It seems that due to codeshares and mergers there's just a shortage of unique flight numbers. These are considered as two separate flights. It's not uncommon.
Indeed, I can't see a problem here. The one to watch is where the same flight number was used as AAA-BBB-CCC, where the TPs and Avios would reflect AAA-CCC only if travelled on the same day. If travelled on 2 days it would credit as AAA-BBB then BBB-CCC.
Here AAA-BBB-AAA should credit as AAA-BBB then BBB-AAA.