Is there a download I am missing? I am running Sage 300 ERP with update pu3

Is there a download I am missing? I am running Sage 300 ERP with update pu3. I am trying to export certain data out of the PO header file, only what I am looking for is not in the list of fields that can be downloaded. One specific field is "Reference". There are about 146 header fields to select from but that is not one of them. However, if you leave "All" selected and just accept an export of all records, you receive about 172 fields, which "Reference" is one? I can't export all 172 as I need only about 12 fields at most. Is there a fix for this?