What is the correct way to apply part of a payment due to a vendor to an invoice?

We use Quickbooks Pro 2010 and want to deduct part of a payment due to a vendor to cover an outstanding invoice for them. The invoice is setup on the customer side, however for simplicity it would be much easier to deduct the invoice payment than have to issue a check for the full amount and wait on the return... show more We use Quickbooks Pro 2010 and want to deduct part of a payment due to a vendor to cover an outstanding invoice for them. The invoice is setup on the customer side, however for simplicity it would be much easier to deduct the invoice payment than have to issue a check for the full amount and wait on the return check. Is it possible to do this in Quickbooks? Even more importantly, is this "incorrect" from an accounting perspective?
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