UpdateListItems web service does not update field - microsoft.public.sharepoint.portalserver

Message from discussion UpdateListItems web service does not update field
Thread-Topic: UpdateListItems web service does not update field
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Subject: UpdateListItems web service does not update field
Date: Thu, 2 Jul 2009 13:27:01 -0700
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This question was posted by a colleague but it hasn't received a reply.  I'm 
guessing his TechNet benefits was not configured correctly so I'm reposting 
it for him.

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I'm using _vti_bin/lists.asmx?op=UpdateListItems web service to update a task 
list field passing the required infromation but the update does not take 
place and the web service does not return an error. The ID of the item exists 
and is the correct item to update. The account used by the web service to 
make the update has Contirbute permissions on the list. Any ideas what has 
gone wrong?

Here is a sample of the xml used.

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
        <UpdateListItems 
xmlns="http://schemas.microsoft.com/sharepoint/soap/"> 
            <listName>Tasks</listName> 
                <updates> 
                    <Batch OnError="Continue" ListVersion="1"> 
                    <Method ID="1" Cmd="Update"> 
                        <Field Name="ID">199</Field> 
                        <Field Name="AssignedTo">Joe</Field> 
                    </Method> 
                    </Batch> 
                </updates> 
        </UpdateListItems> 
    </soap:Body>
</soap:Envelope>