Over the back ???

[TKATNL]

Hello everyone after a couple days as a guest I have joined the forum. What a great web site, I have learned alot in the past day or so. I am a new basketball ref. I'm doing 5,6,7,8 grade "classic" ball, it is taken very seriously. My question is on an over the back foul on a rebound. If player A1 is in position to rebound and B1 jumps up and gets the rebound over the top without contact should there be a call ? Or should an over the back call be made only when there is contact. B1 was a taller player than A1, the coach kept asking for over the back. Any clarification would be great.