Version & is blocked for &

What causes this issue?

The indicator "Version blocked" was activated for version &V1& of
controlling area &V3& in fiscal year &V2&.

System Response

You can no longer change the planning data of this version.

How to fix this error?

Enter a different verison, or
deactivate the blocking indicator in version maintenance.
<DS:TRAN.OKEQ>Execute function</>

Error message extract from SAP system. Copyright SAP SE.