Where an Inventory Journal already exists, an invoice cannot be re-posted without first clearing the Journal.
Sync Unposted Invoices Records in Wise-Sync
Processing the "Unposted Invoices" in Wise-Sync will then batch this record to Xero:
Step: Click on the Journal Link from within the error message.
The Xero Record will then be displayed.
Void Xero Journal
Re-Sync the record in Wise-Sync