title: NHibernate left join a unrelated entity
body: <p>I have two entities:</p>
  
  <pre><code>Konto
  - Id
  - MwstId
  
  Mwst
  - Id
  - Code
  </code></pre>
  
  <p>Both entities are correct mapped in Nhibernate - but the Relation between Konto.MwstId -> Mwst.Id is not mapped. I cannot add this map because of structure restrictions.</p>
  
  <p>Now, I try to implement the following Query with NHibernate-QueryOver-API:</p>
  
  <pre><code>select * from Konto k left outer join Mwst m on k.MwstId = m.Id
  </code></pre>
  
  <p>I have tried several approaches, but without any success.</p>