I'm in the middle of a multi-day itinerary that had me flying on a partner airline followed by two onward segments on UA. One partner flight has not yet posted although the next segment (on UA) posted promptly as soon as we landed. I'm considering crediting the upcoming segment (not yet flown) to a different FF program. If I change the ff number at the time I do OLCI for this last UA flight, is there any risk that the unposted segment that I already flew will also get credited to the other program or are the changes made at OLCI strictly prospective?