I do not have any peoplesoft experience. But I wonder if this type of logic in your Post-Process might give you what you want? (Changes RC=17 to RC=0)
:SET &MYRC# = GET_STATISTIC_DETAIL(,RETURN_CODE)
:IF &MYRC# = 0
!: PRINT "GOOD END OF JOB"
:ENDIF
:IF &MYRC# = 17
: PRINT "RC=0017 CHANGED TO RC=0000"
: MODIFY_STATE RETCODE=0
:ENDIF
Another option might be to modify the RunTime tab to make Automic consider RC=17 to be acceptable, but if you do this, then it will also assume the return codes from 1 through 16 are acceptable as well.