Documents posted net are not supported

What causes this issue?

A document with a document type &v1& is reached via the interface.
This document type has the control 'net document type'.
Documents with this control cannot be posted via the interface.

System Response

No further processing in financial accounting is possible.

How to fix this error?

The control of the document type &v1& might be incorrect. If it is
set correctly, post the transaction via the original financial
accounting posting transactions.

Error message extract from SAP system. Copyright SAP SE.