Check Mainframe Subsystem Support enabled to .
Use this page to enable MSS for this enterprise server instance.
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You can use the resolved value of an environment variable in any fields for the entry of file or directory paths. To do this, prefix the environment variable you want to include with a dollar ($) sign; for example:
where production is an environment variable.
If you want to use a dollar sign as part of the value, rather than as an indicator of an environment variable, you must escape the dollar sign character with a backslash(\); for example:
In this case, $production will not be replaced by the value of the environment variable.