Correctible Error

[bseybs32]

High School Game.

Here is the sit. as it was explained to me.
team A is shooting the first free throw of a double bonus foul. Confussion begins and the first shot is missed, rebounded and play begins going in team B's direction. Whistle, play is stopped. Official realizes that it was supposed to be 2 shots not a 1 and 1 situation. Officials line players back up at team A's free throw lane and attempt 2nd shot only. Basket is good. Play resumes with team B taking the ball out a POI.

Is this the correct procedure?

Should the officials have cancelled all action up to the point of interruption, and reshot both foul shots with play continuing after the 2nd attempt?