Below is a list of common errors found after exporting to Xero. Click on them to open the relevant document. - Payment is applied to more than one document. Payments can only be made against Authorised documents Payment amount exceeds the amount outstanding on this document. Invoice not of valid status for modification This document cannot be edited as it has a payment or credit note allocated to it. Account could not be found. Email address must be valid. Another contact has this contact number. Please enter a different contact number. This Payment is not applied.