NS play five-card majors and a strong NT, 1♣ could have been a three-card suit.
3♣ was alerted and explained when South asked as ♦ and ♠, but the actual agreement was ♥ and ♠.
Result: 3NT(S)-3, NS +300, lead ♠2.
The incorrect explanation was established at the end of play. South wanted a ruling because she claimed she would not have bid 3NT had she been told East had both majors. I asked her why she had bid 3NT with the incorrect explanation, with only seven points, and she said it was on the strength of the club fit and stops in the opponents' suits. I asked her what she would have bid over the correct explanation, and she said she would have passed.
What score, if anything, would you adjust to?