HFPC0124E `keyword` VALUE IS DUPLICATED FOR SUBCOMMAND: `subcommand` (`n`).

Explanation
 The same keyword value is specified more than once for subcommand.

System action
 If SCAN=YES is specified, the return code is
set to 8. If SCAN=NO is specified, the job ends with an abend code
of U3003. 

User response
 Correct the command set in HFPSYSIN, and rerun
the job.