Excess payment to supplier account for non adjusting prepayment

We have multiple branches and mutliptle locations. In Branch level the user making the Prepayment Invoice (Like : Lorry Frieght) and standard invoices. Some time the branch accounting user not adjusting the prepayment invoice value against the supplier standard invoice.

We have treasury team in corporate office, they have done all branch's supplier outstanding payment as per the due dates. The corporte user not known wether prepayment invoice value avilalbe or not in supplier account. And they have simply go in to the payment screen and take the invoice and made the payments. In standard the payment screen only it shown for Debit, credit and standard invoice value not in prepyement outstanding.