THis is my code;
Public Overridable Sub SaveOrUpdate(Optional ByVal flush As Boolean = False)
Dim sess As NHibernate.ISession = SessionManagement.GetCurrentSession
sess.SaveOrUpdate(Me)
If flush Then
sess.Flush()
End If
End Sub

Data update to session but not update to database after sess.flush(). And there are not any errors.
It happen when update only and some table.

How can I do?