QuickBooks Online Sync Error: Reference/Check number for this payment is already being used in QBO. The payment may already be recorded in QBO.
Why the Sync Error occurs
This error occurs when a manual payment has a reference number (Ref#) that is already in use in QuickBooks or a manual payment has a Ref# when it is for multiple invoice payments.
How to Fix the Sync Error
There are two options to resolve this issue:
- If the issue is due to a single invoice, edit the payment to update the Ref# to a unique number ~ or ~
- If the issue is due to multiple invoices, edit the payment to remove the Ref#
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