Down-payments for purchase order & & exist

What causes this issue?

Financial Accounting has already made down-payments of &V3& &V4& for
purchase order &V1&, item &V2&.

System Response

The payment program settles the down-payments automatically with the
payments to be made.

How to fix this error?

If you want to allocate a down-payment to a specific invoice, you must
make a transfer posting for the down-payment manually.

Error message extract from SAP system. Copyright SAP SE.