Supplier Credit no longer auto adjust "amount due" on Purchase Invoice

Hi,

That link was about sales invoices, not purchase invoices. Unfortunately Lubos didn’t provide information regarding how to deal with overpaid and underpaid purchase invoices. There doesn’t seem to be a credit account for my supplier either, so I can’t adjust the “underpaid” invoice to simply allocate part of the payment from the overpaid invoice.

Is there a way to deal with this for Purchase Invoices?

EDIT:
I see that the suggested approach is to allocate the overpayment and underpayment to individual invoices. Problem solved. Thanks!