I have a parent document type called __Affiliates which I'm effectively using as a holding folder for a child document type called Affiliate. I've defined a number of different properties on this Affiliate type which are working fine. I've also created a property on the __Affiliates parent, called DefaultTelephone. Unfortunately when I create content of type Affiliate it seems the DefaultTelephone property is inherited from the parent document type. How can I prevent this inheritance?