Overrides

Unlike the REGION keyword, a JOB statement REGIONX parameter is used as a default for any step of the job that does NOT have a REGIONX keyword on the EXEC statement. You can set the region default and only use REGIONX as an override on the EXEC statements that require different region values.

JCL procedure overrides:

Because REGIONX is mutually exclusive with REGION,

REGIONX can replace REGION, and
REGION can replace REGIONX

during JOB statement procedure override processing.

This might result in mutually exclusive conflicts with a REGION= or REGIONX= specification on the JOB statement.

Examine the JCL output listing for uses of REGION and REGIONX.

START command invocation

For a started job, a REGION= or REGIONX= specification on the START command can replace a REGION= or REGIONX= specification on the JOB statement.

For a started procedure, a REGION= or REGIONX= specification on the START command can replace a REGION= specification on the JOB statement that is generated internally by START command processing.

This might result in mutually exclusive conflicts with a REGION= or REGIONX= specification on the JOB statement of the procedure.

Examine the JCL output listing for uses of REGION and REGIONX with the started job or started procedure.