Invoice already exists with payment(s) applied or Error Invoice already in a fully paid state.
How Can this Happen?
The sync issue is that the records can't be updated, as the invoice in Xero/QBO has already a payment/s applied.
The issue may also occur when a Bill in Xero/QBO uses the same Invoice number in ConnectWise, preventing the sync. Wise-Sync somehow recognizes this Bill as an Invoice
If the invoice was previously synced and has to be resynced because of the recent changes, please follow the steps below:
1 Remove the payment in Xero/QBO
2. Re-sync the invoice
3. Re-apply the payment in Xero/QBO
However, if the invoice details in ConnectWise matches with the Xero/QBO invoice, then no need to resync the invoice, just create a Manual Batch to remove it from the Unposted Invoices in ConnectWise.
And if there’s AP Bill created in Xero/QBO with the same invoice number, rename the bill or add a prefix “PO” or “Bill” then re-sync the invoice.