Sage Intacct sync error: Transaction 'XXXX' is already paid and can't be deleted

Why the sync error occurs

This sync error has five possible causes:

A payment has been voided and the related AP bill has been deleted in Cashflow360. Because the AP bill is still marked as paid in Sage Intacct, the sync is unable to delete it.
An update has been made to an AP bill in Cashflow360 that's already paid in Sage Intacct. When an AP bill is updated in Cashflow360, the sync deletes the AP bill in Sage Intacct and recreates it as the updated version. Because the AP bill is paid in Sage Intacct, the sync is unable to complete the deletion.
An update has been made to an AP bill in Cashflow360 that was previously paid in Sage Intacct, but that payment was voided.
The AP bill was deleted in Cashflow360, but the AP bill is paid in Sage Intacct.
The AP bill can't be found in Sage Intacct, because it's been deleted or is located in a different entity.

The solution for this sync error depends on the cause:

Verify the AP bill should be deleted in Cashflow360.
- Paid AP bills can't be deleted in Sage Intacct. Deleting the AP bill in Cashflow360 will result in an imbalance between Sage Intacct and Cashflow360.
If the AP bill should be deleted in Cashflow360, then clear the error in Cashflow360 by selecting Resolve on the sync status page.
If the AP bill shouldn't be deleted, undelete the AP bill in Cashflow360 and mark it as paid so the systems match.