You make the call

[GaBBRef]

This play occurred in a recent game. A player committed a foul in the first quarter. When the foul was reported the official scorer told the referee that the player had a different number recorded in the official scorebook. When the coach of the offended team was notified he was upset because he said he gave his book to the official scorer. The official scorer said he got the numbers of the players from a program provided. A team technical was assessed the team for having to change a number in the book to the number the player was actually wearing.
Even though the coach was adamant about providing the scorer with their scorebook the technical stood. Even though it was a mistake by the official scorer, it is still the coach's responsibility to make sure the numbers are recorded correctly.
Rule 10-2 says the violation will be called when it occurs. Was the call correct in this case?