public class CollectionEntry
{
    private Int32 id;
    private DateTime created;
    private CollectionGeo geoLoc;

    public CollectionEntry(){}

    public virtual Int32 Id
    {
        get { return id; }
        set { id = value; }
    }

    public virtual DateTime Created
    {
        get { return created; }
        set { created = value; }
    }

    public virtual CollectionGeo GeoLoc
    {
        get { return geoLoc; }
        set { geoLoc = value; }
    }
}

public abstract class CollectionGeo
{
    private Int64 id;
    public override abstract String ToString();

    public virtual Int64 Id
    {
        get { return id; }
        set { id = value; }
    }
}

public class PointGeo : CollectionGeo
{
    private Double lat;
    private Double lon;

    public PointGeo() { }

    public virtual Double Lat
    {
        get { return lat; }
        set { lat = value; }
    }

    public virtual Double Lon
    {
        get { return lon; }
        set { lon = value; }
    }
}

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="DataAccessManager" namespace="DataAccessManager.Collections">
  <class name="CollectionEntry" table="collectionentry">
    <id name="Id">
      <column name="id" sql-type="int" length="11" not-null="true"/>
      <generator class="assigned"/>
    </id>
    <property name="Created" column="created" sql-type="datetime"/>
    <one-to-one name="GeoLoc" class="CollectionGeo" cascade="all-delete-orphan" fetch="join"/>
  </class>
</hibernate-mapping>

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="DataAccessManager" namespace="DataAccessManager.Collections">
  <class name="CollectionGeo" table="collectiongeo">
    <id name="Id">
      <column name="id" sql-type="bigint" length="20" not-null="true"/>
      <generator class="assigned"/>
    </id>
    <joined-subclass name="PointGeo" table="pointgeo">
      <key column="id" foreign-key="CollectionGeo.id"/>
      <property name="Lat" column="lat"/>
      <property name="Lon" column="lon"/>
    </joined-subclass>
  </class>
</hibernate-mapping>

ITransaction tx = sess.BeginTransaction();

IQuery q = sess.CreateQuery("from CollectionEntry colEnt order by colEnt.Created desc");

IList<CollectionEntry> resultSet = q.List<CollectionEntry>(); // fails here

NHibernate.ADOException was unhandled
  Message="could not execute query\r\n[ select collection0_.id as id3_, collection0_.tailNumber as tailNumber3_, collection0_.requestingUser as requesti3_3_, collection0_.created as created3_, collection0_.filled as filled3_, collection0_.lastModified as lastModi6_3_, collection0_.status as status3_, collection0_.synced as synced3_, collection0_.type as type3_, collection0_.approved as approved3_, collection0_.start as start3_, collection0_.latest as latest3_, collection0_.res as res3_, collection0_.scan_duration as scan14_3_, collection0_.revisit_rate as revisit15_3_, collection0_.eoir_height as eoir16_3_, collection0_.eoir_width as eoir17_3_, collection0_.eoir_prod_id as eoir18_3_, collection0_.radar_prod_id as radar19_3_, collection0_.radar_priority as radar20_3_, collection0_.radar_alt as radar21_3_, collection0_.radar_coll_az as radar22_3_, collection0_.radar_latest_start as radar23_3_ from collectionentry collection0_ order by  collection0_.created desc ]\r\n[SQL: select collection0_.id as id3_, collection0_.tailNumber as tailNumber3_, collection0_.requestingUser as requesti3_3_, collection0_.created as created3_, collection0_.filled as filled3_, collection0_.lastModified as lastModi6_3_, collection0_.status as status3_, collection0_.synced as synced3_, collection0_.type as type3_, collection0_.approved as approved3_, collection0_.start as start3_, collection0_.latest as latest3_, collection0_.res as res3_, collection0_.scan_duration as scan14_3_, collection0_.revisit_rate as revisit15_3_, collection0_.eoir_height as eoir16_3_, collection0_.eoir_width as eoir17_3_, collection0_.eoir_prod_id as eoir18_3_, collection0_.radar_prod_id as radar19_3_, collection0_.radar_priority as radar20_3_, collection0_.radar_alt as radar21_3_, collection0_.radar_coll_az as radar22_3_, collection0_.radar_latest_start as radar23_3_ from collectionentry collection0_ order by  collection0_.created desc]"
  Source="NHibernate"
  StackTrace:
       at NHibernate.Loader.Loader.DoList(ISessionImplementor session, QueryParameters queryParameters)
       at NHibernate.Loader.Loader.ListIgnoreQueryCache(ISessionImplementor session, QueryParameters queryParameters)
       at NHibernate.Loader.Loader.List(ISessionImplementor session, QueryParameters queryParameters, ISet querySpaces, IType[] resultTypes)
       at NHibernate.Hql.Classic.QueryTranslator.List(ISessionImplementor session, QueryParameters queryParameters)
       at NHibernate.Impl.SessionImpl.Find(String query, QueryParameters parameters, IList results)
       at NHibernate.Impl.SessionImpl.Find[T](String query, QueryParameters parameters)
       at NHibernate.Impl.QueryImpl.List[T]()
       at RAISR_FV_GUI.OverlayManagerForm..ctor() in C:\Documents and Settings\PrestJo1\Desktop\Software_0.2\RAISR_FV_GUI\OverlayManagerForm.cs:line 40
       at RAISR_FV_GUI.Program.Main() in C:\Documents and Settings\PrestJo1\Desktop\Software_0.2\RAISR_FV_GUI\Program.cs:line 17
       at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()

"identifier type mismatch\r\nParameter name: id"