Checkboxes from table works wrong in Ticket

  1. I’ve created an extra field for ticket module as “Checkboxes from table” type.
  2. In value I’ve write “product:label:rowid” to have a list of product to choosw within
  3. ticket creation is fine. I can choose and data uis saved.
  4. If reopen the ticked and edit the field, list is shown correctly BUT data is not saved and field is BLANK !

any suggestion ?