You are looking a way to replace DDIC user with user RDDIM_JOB in client 000 (as per note 1998382) for starting the job RDDIMPDP. But even after changing the user if you check the job after some time, you can see the user DDIC not user RDDIM_JOB in option STEP (define step).
SAP S/4HANA 1511
SAP S/4HANA 1610
SAP S/4HANA 1709
SAP S/4HANA 1809
SAP S/4HANA 1909
SAP S/4HANA 2020
RDDNEWPP2, DDIC, SAP_TRIGGER_RDDIMPDP, rdisp/job_repo_activate_time, RDDIMPDP, STJR_JOBD_CUST, SJOBREPO, RDDNEWPP , KBA , BC-CCM-BTC-JR , Technical Job Repository , BC-CTS-TMS , Transport Management System , How To
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