I siobWstartdate, siobWperiod,
_RL siobWperiod
& siobWperiod, siobWstartdate,
IF ( siobWperiod .GT. 0 ) THEN
& siobWstartdate1, siobWstartdate2, siobWperiod
siobWperiod = UNSET_RL
IF(siobWperiod .EQ.UNSET_RL) siobWperiod = obcsWperiod