You already made the payment, edit it and change the account used as the expense to accounts payable - that will set a vendor credit
without creating a new expense, that you do not have, as intuit suggests
I can show you a way to record your over-payment to the vendor, brian-steele.
All you need to do is to create a supplier credit. Here’s how:
This should reflect the credit in your supplier’s profile. Also, there are two ways to use this available credit. For more information, please check this
We’re just a post away if you need anything else.