integer siobWstartdate1
& siobWstartdate1, siobWstartdate2,
I siobWstartdate1, siobWstartdate2,
& siobWstartdate1, siobWstartdate2, siobWperiod
siobWstartdate1 = UNSET_I
IF(siobWstartdate1.EQ.UNSET_I ) siobWstartdate1=obcsWstartdate1