FAQ - ExpensiError XRO031: Payment has been already been allocated to reimbursable expenses
If you receive this error, then your report has reimbursable expenses and already been exported once, but a payment has been issued (and therefore cannot be modified in Xero). You cannot export again unless you reverse this payment.
To resolve this error, follow these steps:
In Xero, navigate to this report by going to Accounts > Purchases > select the Paid tab.
Next, click into the transaction select the blue text that says Payment.
Click Options and then Remove and Redo to delete the payment.
Finally, re-export the report. The new export will override the current report in Xero and retain the same report ID.