In a search, when we try to export data as CSV from a repeater, we get the columns twice: once all available columns of the repeater, then the column we want to export.

For example:

• In the course search model, add the columns (default):

  <item ref="contacts"/>
  <item ref="contacts/persons"/>

• Open the course search, and filter the columns to display with: title, code, contacts/persons.
• The CSV export is like this:

  "Libellé";"Contact(s)";"Contact(s)";"Code";
  "Réseaux Electriques";"Gérard Dupont
  Camille Martin";"Gérard Dupont
  Camille Martin";"ELP1548";
  "Vecteur hydrogène et piles à combustibles";;;"ELP1545";
  "Estimation du potentiel)";;;"ELP1547";
  "Anglais S2";;;"ELP1518";
  "Stage M1 Energie";;;"ELP1520";
  "Bioénergies";;;"ELP1523";