This article provides help on specific Xero errors that may be returned when exporting invoices from Timesheet Portal.
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You will know whether an error is a Xero error if your error message starts with Xero Response:
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​ Xero Response: This document cannot be edited as it has a payment or credit note allocated to it.
​ You have attempted to re-export an invoice which was previously exported to Xero, but it cannot be modified now because you have allocated a payment or credit note against the invoice in Xero. To resolve this issue, please locate the invoice in question in Xero, and remove the associated payment to it. You can find further instructions on how to do this within Xero.