title: override identitycolumn hibernate mssql
body: <p>I have to manage a Datatransfer between 2 DBs (mssql) with hibernate.
  When i load an object from one DB with <code>session.get()</code> it already has a private key. Then i need to persist it to the other DB with <code>anotherSession.replicate(Object o)</code>.
  My Problem ist, that the given PK is not persisted but replaced by another one.</p>
  
  <p>PS: Both the srcTable and the destTable have PK generation Identity and it needs to stay that way.</p>