Foul on made shot

[Mark Dexter]

A1 puts up a long 2. While the ball is in the air, A2 pushes B1, and I call a foul on A2 (we can debate whether I should have or had not later!).

I turn to the table and say "Foul on A2, no shot, blue ball." About two seconds after the ball has been put into play, I realize the basket should have counteds . What do you do, and how long is something like this correctable. (I'll let you know what I did later.)