See below for a list of error messages you might encounter when attempting to automatically upload your invoices and payments to Xero and how to fix them. Error messages appear in the top right-hand corner of the screen when an invoice fails to upload to your Xero.
Invoice update failed. Invoice # must be unique
This error occurs when you try to save an invoice on Semble but to the number is already in use in Xero.
Solution: You can correct this error by deleting the invoice from Xero that has already been sent from Semble or you can edit the invoice number on Semble.