I find this all very strange... IATA does not allow for the change of the first flight against the same conditions as at the time of the original sale. They require the carrier to reissue at the price at the time of the change.

It is not in the OWE rules (since this is no OW rule) but it is in the rule sheet for the OWE for agents. I gave a CX example earlier but I cannot find one that does not state that.

So anybody with proof (personal preferably) that this is done (not could be done or they told me so) under normal circumstances. please post it here.