[Add] When I add a value with unit it should not be possible to enter a URI via the UI. It is only possible to select an Item that represents the unit.
[Edit] When I edit a value with a unit:
- **Wikidata concept URIs :** it should never show the URI instead the label always is shown.
- **Some URI:** it should show the URI and it should allow me to edit the value, but it is only possible to change the URI by selecting an item.
In essence this means it is only possible to enter non local URIs via the API, but there must be a configuration that allows to reject non concept URIs of the vocabulary lookup repository.
Keep in mind:
In the future it should be possible to configure a remote vocabulary lookup repository that has the same behavior as on Wikidata (selecting, label resolving)