GOS024I   SOM/MVS ssname cmdname COMMAND ERROR -- SPECIFIED KEYWORD IS NOT VALID.

Explanation

The command entered, cmdname, specified a keyword that is not supported.

In the message text:
ssname
The name of the SOMobjects® subsystem.
cmdname
The name of the command that was entered.

System action

The SOMobjects subsystem stops processing the command.

Operator response

If the keyword was misspelled, enter the command again with the correct keyword specified. Otherwise, if the keyword should not have been specified, enter the command again without the unsupported keyword.

Source

SOM