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 Bill.com 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

  1. Click the payment confirmation number from the sync status page
  2. Click the edit icon
  3. Enter a unique Ref # not in use in QuickBooks Online
    • If paying multiple bills with one offline payment, remove the Ref # completely
  4. Click Save
  5. Sync again

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