Run schedule headers with a different validity exist for production vers.

What causes this issue?

You want to change the validity period of a production version that is
used in a run schedule header.

System Response

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

How to fix this error?

The validity period of the production version cannot be changed.

Error message extract from SAP system. Copyright SAP SE.