I siobNstartdate, siobNperiod,
_RL siobNperiod
& siobNperiod, siobNstartdate,
IF ( siobNperiod .GT. 0 ) THEN
& siobNstartdate1, siobNstartdate2, siobNperiod,
siobNperiod = UNSET_RL
IF(siobNperiod .EQ.UNSET_RL) siobNperiod = obcsNperiod