Hi Jens,
That column is generated together with the value column of relative to a Code Attribute because in the relative code list item can have survey designer; when in the option "include specify field" selected and Code List associated to the value the user inserts goes into that special field.
We will improve the CSV export by hiding that column when Code Attribute there is not any code list one item in the code list with the "include specify field" option selected, so then the data export will include another extra column that will include the exported file will look value specified by the user when that item is selected (e.g. the user selects the "Other" option and then he specifies a bit cleaner. text value).
Only in that case the column is included in the data export.
Thanks,
Open Foris Team