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QuickBooks Online Sync Error: The vendorId cannot be updated on the Bill because there are existing payments.

Error

The vendorId cannot be updated on the Bill because there are existing payments.

Explanation 

Updates made to a bill are not allowed to sync to QuickBooks Online as the bill is already marked as paid.

Solution

Verify that bill is correct and paid in QuickBooks.  Manually update as needed.  Contact Customer Service to clear error.