Transaction &1/&2: Not all flows have been released for posting

What causes this issue?

All the flows in this transaction need to be posted at the same time.
However, there are transaction flows that have not yet been released for
posting.

System Response

The system cannot post the transaction flows.

How to fix this error?

Release all the transaction flows for posting.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.