BACKCOURT VIOLATION?

[OFISHE8]

We had a situation last night in a high school boys game where A1 was inbounding the ball under its own basket in the frontcourt. The inbound pass was thrown towards the half court line and A2 tapped the ball in the frontcourt and it went into the backcourt. When he went to the backcourt to retrieve the ball, my U2 called a backcourt violation. After the game, we discussed the play and, being the Referee, focused on wheter or not A had team control on a tap in the frontcourt. I usually do not call a backcourt violation. What do you guys think?