CPHMC0135E The SYSID SYSID specified for the new region matches an existing CICS region SYSID in the CICS DA Model.
Explanation
The SYSID for the new region must not match a SYSID of a region already in the DA model.
System action
The command fails.
Response
If the existing entry with the SYSID in the model is no longer valid then delete it from the model, or enter a different SYSID and try again.