title: Multiple Levels of Children Entity Objects in Fluent NHibernate/NHibernate
body: <p>I have a entity which has a list of Child1 objects. The mappings seem 
  to work fine for this. If I try to add a list of Child2 objects to the 
  Child1 entity and set up the mapping a xml mapping doesn't seem to get 
  created and I get this error: </p>
  
  <p>Test method 
  vRATest.ORMTest.NHibernateTests.NHibernate_Should_Be_Able_To_Get_All_Routes­_Using_ProjectID 
  threw exception:  NHibernate.MappingException: Association references 
  unmapped class: vRA.Domain.RouteLocationNH. </p>
  
  <p>I have checked my entities and mappings several times now but I can't 
  seem to figure out how to make this 3rd level work. Is this even 
  possible in Fluent NHibernate or even NHibernate? I am new to both of 
  these technologies so thought I'd better ask. If anyone has a working 
  example of 3 levels of entities that work I'd appreciate seeing how to 
  do this. </p>
  
  <p>thanks in advance! 
  Bill </p>