You can resolve payment validation errors on the page Resolve payment validation errors by removing one or more documents payable.
What can you do to remove documents from a payment?
"By removing one or more documents payable from a payment that's included in the payment process request." "By removing one or more documents payable from a payment that's included in the payment process request." "By removing one or more documents payable from a payment that's included in the payment process request."