Manual release and manual posting not allowed

What causes this issue?

In Customizng, you use the step for maintaining global settings to
stipulate that the individual requests can only be bundled
retrospectively. In such cases, parked documents are usually approved
and posted by means of Workflow.

System Response

The transaction cannot be executed

How to fix this error?

Please use Workflow.

Error message extract from SAP system. Copyright SAP SE.