Correctable Error

[ScottParks]

I know I blew this, but what is the right call?

Situation: A5 makes a 2 point jump shot and is fouled by B1 (foul call by partner). During the dead ball, B1 is given a T by partner for "intent in throwing the ball to official". Both fouls reported to scorer's table, we then proceed to free throw line and administer, in order, one free throw for foul shot, then two free throws for technical. A coach had A5 shoot all free throws.

Scorer calls us over to table and asks why we shot 3 free throws. I explain that 1 for foul during made basket and 2 for technicals. Partner says that he called the foul after the shot and on the floor!

A5 was awarded an additional free throw that he should not have gotten. I wrongly said this was a non-correctable error (because we had already taken additional free throws) and let it stand and explained same to both coaches.

Now, what should have been done? Wipe out the first free throw as it was awarded for the shot or the last free throw?