Sharing the CSD between different releases of CICS

If, after upgrading a CSD, you plan to share the CSD file with earlier releases of CICS, you must include the appropriate DFHCOMPx compatibility groups in your startup group list.

The CICS® Transaction Server for z/OS® Migration from CICS TS Version 2.2 has information about sharing the CSD between different releases of CICS. It shows you which DFHCOMPx groups you need to include for the earlier releases. Do not attempt to share a CSD file with a CICS region running at a higher level than the CSD file.