No control on return to vendor

Return to vendor option allows to return stock even after payment and system don't prompt inventory user about the payment(12.1.3). What is the best practice and process to handle so that all parties inventory, purchase and payable should well aware of it for example:

When inventory user return any goods he should aware that payment is already done against this PO.

Payable user get some alert or information that some goods is return to vendor of the invoice that payment is already done.

Purchase user should also aware so that he can follow up supplier.