Parked document is release-relevant and cannot be posted

What causes this issue?

The document is subject to a release procedure, controlled via a
workflow, since it contains criteria that are subject to release.

System Response

You cannot post the document from the online transaction.

How to fix this error?

If the document is not complete, you should complete it so that it can
be released via the workflow.
If you urgently need to post the document, ask the person responsible
for releasing it if he or she can process it with higher priority.

Error message extract from SAP system. Copyright SAP SE.