Minimum payment to a supplier

We are supposed to pay minimum payments to a supplier per month. If the minimum amount is reached when we cut our regular POs to suppliers, we do not need to make any extra payments.

If the minimum is not reached, we have to make up the difference by sending the supplier a payment for the difference(Minimum - Amount of POs cut to the supplier for that month).

We need to store the minimum amounts by supplier by month. Reports can be used to compare amounts from POs cut to the Minimum amount and calculate the difference. There will be some manual process to check what the difference amount is and make the payment