Over the back, ON the back RM article

[bob jenkins]

Originally Posted by Forksref

I think some folks in here are choosing to ignore what Legal Guarding Position is. In some cases you may choose to have a no-call, but it is certainly not a charge if you don't have LGP established.

You can clearly have a PC foul without the defender having LGP. The LGP just gives the defender additional rights (the right to move to mainitain position).