CICS-supplied compatibility groups

After you upgrade a CICS system definition data set (CSD), if you plan to share the CSD with earlier releases of CICS you must include the appropriate DFHCOMPx compatibility groups in your startup group list.

For more information about sharing the CSD between different releases of CICS, and which DFHCOMPx groups you must include for the earlier releases, see CSD compatibility between different CICS releases.

Do not attempt to share a CSD file with a CICS region that is running at a higher release level than the CSD file.