QuickBooks Online sync error: You must specify a different number. This number has already been used

Why the sync error occurs

This error occurs when the reference number (Ref#) on a Cashflow360 offline payment is already in use within QuickBooks Online or has been entered on a payment that is for more than one invoice.

How to fix the sync error

Void the offline payment and record a new offline payment with the correct reference number.

  1. Select the Payment confirmation number from the sync status page
  2. Select Void payment
  3. Select Yes to confirm

Record a new offline payment for the bill(s).

Alternatively, record the payment manually in QuickBooks Online and contact Customer Support to request the sync error be cleared.