Linked Servers To Lotus Notes

Hello,

I have successfully linked a Lotus Notes server to our SQL Server
database using an ODBC connection.
This works fine when wanting to select records
eg openquery(LOTUSNOTES2, 'select * from Person' )

The problem I have is when I try to update the record I get an error
eg
update openquery(LOTUSNOTES, 'select * from Person where
MailAddress=''nick.bloor@sandh-ltd.com''' )
set JobTitle='Test'

Produces the following error
==========
OLE DB provider 'MSDASQL' reported an error. The provider did not give
any information about the error.
OLE DB error trace [OLE/DB Provider 'MSDASQL' IRowset::GetNextRows
returned 0x80004005: The provider did not give any information about
the error.].
===========

I have tested the ODBC connection using an Access database. The link
tables facilities enable me to select what I think should be the
primary key. If I select a primary key then I can use Access to update
the lotus notes database, however if I don'k select a primary key, the
table is not updateable.

I believe that if I can somehow create an index on the linked table
within SQL Server, I should be able to update the Lotus Notes database
from SQL Server, but I cannot find a way of doing so.

As the Lotus Notes software is third party, I cannot actually change
anything on that server.

Thanks for any help.

Regards

Nick Bloor