Post Processing - creating data file issue

Are you running this from the Datamapper GUI? If so, the answer is here

If not, then try this:

var records = [].slice.call(data.records);

records.forEach(function(record) {
    SequenceNumber = record.SequenceNumber;
    CardNumber = record.HRN;

    fileOut.write(SequenceNumber + ',' + CardNumber);
    fileOut.newLine();
}
fileOut.Close();