title: Sitecore - Restrict item by Data Template Type on a Field
body: <p>I would like to restrict the data type of items a user can select on a field. I can do this by Insert Options of tree node in the field's source, but this feels a little open to abuse - say a developer accidentally moves an item of the wrong type under this node then the system falls down. I am possibly over worrying this, but in other CMS I have had the ability to restrict the type of an item a user can select. What is the best way to go about this.    </p>