Reference/Check number for this payment is already being used in QBO. The payment may already be recorded in QBO.
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.
- Edit the payment to update the Ref# to a unique number if it is for a single invoice
- Edit the payment and remove the Ref# if is it for multiple invoices