You must specify a different number. This number has already been used.
This error occurs when the reference number (Ref#) on a Bill.com offline payment is already in use in QuickBooks Online (QBO) or has been entered on a payment that is for more than one invoice.
- Go to Payables>>Payments
- Click History at the top
- Locate the payment with the error and click the Payment Confirmation #
- Click the the edit icon on the top right and enter a unique Ref # that is not already in use in QBO and save.
- If you are paying multiple bills with one offline payment, please remove the Ref # completely
- Sync again
Alternatively, you can record the payment manually in QBO, and contact Bill.com Customer Support via chat or email to clear the sync error.