| 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, see details. |
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