try to debug your code using alerts.
var lt_cond = xfa.datasets.dataDescription.Z_FM_PNC_CORRResponse.r......
var rowCount = lt_cond.nodes.length;
xfa.host.messageBox("rowCount = " + rowCount);
for( var i = 0; i<rowCount; i++){
thisValue = lt_cond.nodes.item(i).COND_DET.CCONDTYPE;
xfa.host.messageBox("Value = " + thisValue);
if(thisValue != "BC0269" )
{
this.presence = "hidden";
xfa.host.messageBox("Hidden Successfully");
}
}
Hope this helps.