Joined: 06 Jun 2008 Posts: 8117 Location: East Dubuque, Illinois, USA
From the JCL Reference manual on SYSAFF:
Note: Use the SYSAFF parameter to ensure the conversion and execution of the job will be done on a specific system. If you code SYSAFF, both processes are done on the specified system.
Since conversion/interpretation occurs in JES before any execution can start, the ONLY way what you want to do would work is if you create and submit via the internal reader a separate job with the SYSAFF on that job.