Determine JES interface level

[lars-sh]

1. The JES interface level should be determined at login.
2. Performing actions on interface levels not equal to 2 shall fail based on an interface level 1 compatibility configuration:
   • THROW_EXCEPTION
     Throw an exception if the interface level is not equal to 2 (default)
   • PROCESS_IF VALIDATE
     Validate each process for guaranteed compatibility.
   • PROCESS
     Ignore the interface level and process anyway (highly discouraged)

Open Points:

• How to set the configuration value?
• How to handle unknown interface level values?

[lars-sh]

It seems, JES interface level 1 does not seem to support job IDs longer than 8 characters.

See https://www.ibm.com/support/pages/ftp-clients-failing-retrieve-jes-output-zos-ftp-server