Proper application for correctable error?

[Nevadaref]

Originally Posted by La Rikardo

My gut feeling is that once the officials allow the ball to become live for B's throw-in, their opportunity to call the violation by A2 is passed. However, I can't find a rule reference that explicitly puts a deadline on when the officials are allowed to make or change a judgment call. Any guidance?

Same as if A1 had traveled while making a lay-up. You have to make the call when it happens, not after the opponent advances the ball to half-court.