title: Exclude Models from being saved with Breeze
body: <p>I have EntityA which has a navigation property to EntityB. In the frontend it's possible to create a new EntityA and append it to EntityB. If I now try to save the new created EntityA, Breeze also want's to save the changes on EntityB (containing the new ID of the newly created EntityA). Is it somehow possible to avoid having EntityB, because in this specific use case it should be possible to append new entities to EntityB, but these should not be saved back (and also not be reported as pending changes)?</p>
  
  <p>I see the possibility with using two EntityManagers, but this would mean that I can no longer have navigation properties between the two types.</p>