Over and back rule

[dbmcubs21]

This question stems from two calls I have seen made in the past few weeks: one in a Big Ten game and one in an intramural game. The call in question is the over and back call. I know all the good stuff about the three points and so on, but my question deals more with the actual possession of the ball.

In both cases the ball was tipped back on a rebound attempt by a member of the shooting team. In the Big Ten game it was a free throw attempt and the intramural game was on a field goal attempt. The rebounder slapped the ball backwards and it was recovered by the "shooting" teams only to be called over and back in both situations.

The intramural call was against my team and they turned to me to ask if it was the correct call (I'm an IM official as well) I told some of my teammates it was the correct call (based on what I had seen in the Big Ten matchup a few weeks ago). Anyone have a good answer for this? Correct call or not and why?