NHibernate Issues

Arghhh, I am really starting to hate NHibernate List support. However, this is my problem and not NHibernate's. I just have to figure out how this is supposed to work.

I have a list collection

<list name="EmailNotifications"
      table="Rules_Notifications"
      access="nosetter.camelcase-underscore">
    <key column="OrganizationId" />
    <index column="Indexer" />
    <composite-element class="Cystem.Notification,Cystem">
        <property name="Email" type="String" />
        <property name="Language" type="Cystem.LanguageType,Cystem" />
    </composite-element>
</list>

However when I go to execute the following code I get an exception:

private void RemoveFromList(int index, IList list)
{
    if(list.Count > index)
    {
        object o = list[index];
        list.Remove(o); 
    }
}

//or

private void RemoveFromList(int index, IList list)
{
    if(list.Count > index)
    {
        list.RemoveAt(index);   
    }
}

I get the following error:

NHibernate.HibernateException: SQL insert, update or delete failed (expected affected row count: 1, actual affected row count: 2). Possible causes: the row was modified or deleted by another user, or a trigger is reporting misleading row count.
    at NHibernate.Impl.NonBatchingBatcher.AddToBatch(Int32 expectedRowCount)
    at NHibernate.Collection.BasicCollectionPersister.DoUpdateRows(Object id, PersistentCollection collection, ISessionImplementor session)
    at NHibernate.Collection.AbstractCollectionPersister.UpdateRows(PersistentCollection collection, Object id, ISessionImplementor session)
    at NHibernate.Impl.ScheduledCollectionUpdate.Execute()
    at NHibernate.Impl.SessionImpl.Execute(IExecutable executable)
    at NHibernate.Impl.SessionImpl.ExecuteAll(IList list)
    at NHibernate.Impl.SessionImpl.Execute()
    at NHibernate.Impl.SessionImpl.Flush()
    at NHibernate.Transaction.AdoTransaction.Commit()

Any thoughts?

Dru