Xero common errors

Item no.	Error message	Module	Description	How to resolve
1	Response code 400 - Invoice not of valid status for modification	Invoice	Client modified invoices after they had already payments or approved. Scoro won't sync it anymore and also don't change status.	User can mark the error as resolved.
2	Response code 400 - The quantity value '-1.0000' is invalid. Quantity must not be less than zero. -- The Total for this document must be greater than or equal to zero.	Bills	Bill quantity is negative.	Fix the bill quantity.
3	Response code 400 - The Total for this document must be greater than or equal to zero.	Bills	Bill sum is negative.	We don't support credit bills synchronization. Check the bill and modify it so that the final sum is a larger number than zero.
4	Response code 404 - status: “AUTHORIZED”	Bills	Can't modify authorized bills.	Mark the error as resolved.
5	Response code 401	General	Credit invoice - was already authorized, can't re-sync.	90% of cases - re-sync solves the issue.
6	Prepayment document with no can not be found in Scoro	Prepayment	Prepayment is created in Xero and it has the wrong reference number or no reference number at all. When syncing invoices, Xero tries to connect the created prepayment with a prepayment in Scoro. If no match is found, it will give an error.	Change the prepayment invoice number in Xero or create a new one.
7	Response code 400 - This organization has Construction Industry Scheme enabled. Existing Invoices with Construction Industry Scheme deductions cannot be edited via the API	Invoices, Bills	User has turned contacts to CIS contacts in Xero and now trying to send an invoice or a bill via API to Xero that has CIS contact linked to it.	Such invoices/bills can't be synced via API - https://central.xero.com/s/article/Construction-Industry-Scheme-CIS-in-Xero

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