Invoice Verify operators can reject invoices.
Some DOCUMENTS systems include an add-on that communicates with the target system at Output. If the data is somehow invalid or otherwise not acceptable to the target system—perhaps the supplier listed on the document does not exist in the target system, or a customer order number is incorrect—the document can be "rejected" and sent back to Verify. There you see information about why the document was rejected.
When is selected, the whole batch is rejected even if the output is done on the document level.
When a document is rejected, it does not cost the system any license credits.