SOLUTION: You'll need to change the transfer to accounting value on the invoice to No or Ignore. In order to change this value, click on Additional Fields on the invoice and change the value. Save the changes in order to have the ability to unpost the invoice.
IMPORTANT CONSIDERATIONS:
This feature is mainly used with 3rd party General Ledger Systems, NetSuite for example. In the event an invoice is unposted and deleted, you'll need to manually update your 3rd party system, as Zuora will not sync such information.
If using NetSuite, you may set the value to Ignore to avoid error messages upon sync. If you need to resync an Invoice, you must delete the NetSuite invoice and set the Zuora invoice’s Transferred to Accounting value to No.
SUPPORTING REFERENCES:
Invoice Transaction Sync
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