(1) alerted, 10-15 pts, 6+ diamonds, no 4-card major
(2) intended as a "frivolous invite" (i.e. accept only with absolute maximum), explained by North as RKCB for diamonds
Result: 5♦(S) -2
West called the director at the end of play and claimed that he would have doubled 4♦ for takeout given South's explanation, and his partner might then have doubled the final contract.
Convention cards give no clue as to what is the actual agreement. North claims to have a comprehensive set of system notes confirming his view, but not with him, unfortunately. (South should have called the director and corrected the misinformation at the end of the hand, but perhaps he was unsure his original view was correct.)
This happened in the last stages of the event at table 1, so assume a high standard. Do you adjust the score?

Help

2NT(1)..P..4♦(2)..P
5♣.....P.....5♦.....P
P......P