Invoice already exists with payment(s) applied

How can this happen?

• The same invoice # is already existing in the accounting package with a payment/s applied. 
• The same invoice # is used to other transaction types (such as credit memo and bill) and are already existing in accounting package with the payment/s applied

Solution

• If the affected invoice was previously synced and needs to be updated in the accounting system, the payment has to be removed first in the accounting package. Once removed, re-sync the invoice and re-apply the payment. 
• If the affected invoice is already existing in the accounting package with the same number but in different transaction types, either rename the invoice number or add a prefix in PSA System (ConnectWise or Autotask) / Accounting Package (Xero or QBO) so the invoice will be synced successfully.