The User Key CSA was available for all up to z/OS 2.3 for ISVs. It has been used for data sharing between STC’s and programs, but with z/OS 2.5 it is not available anymore.
Upgrading to z/OS 2.5 but need to fix this to continue.
CSA will be removed with z/OS 2.4 and forward.
Release : 14.0
Component : Spool
For information regarding Spool and z/OS release compatibility, please refer to the Spool Release Compatibility support page in the documentation:
There is no effect on Spool with the change.