Quarter start sub question

[stripes2255]

Recieved a call from a buddy of mine about a situation last night and of course I am at work without rule book so help me out.

Start of 4th quarter, Team A to inbound at midcourt and before R hands the ball in he is beckoned to the scorers table. He is informed that A6 is on the court to start the quarter but has not properly checked into the game during quarter change. The two officials get together and talk and decide to send A6 off the court and reinsert A5 who was in the game at end of the 3rd quarter.

Team B's HC is livid and wants a technical foul called instead of the way it was handled. Thoughts?