Seems that you all, need so more training @avans ;-)
If you cannot select an attribute in the reference selector there can be multiple reasons
- Reference selector is editable, but no items available > no objects of the referenced entity available
- There aren't any objects
- You have a constraint on the selectable objects, resulting in an empty list
- Reference selector isn't editable
- The reference selector widget is set not editable
- The enclosing dataview or listview is set not editable (then ALL input widgets aren’t editable)
- The user doesn't have write access on the reference