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    <p>I've investigated this and found the same thing. I also tried adding the attribute <code>Cmd="Update"</code> to the <code>Method</code> element without success. <a href="http://msdn.microsoft.com/en-us/library/dd965218.aspx" rel="nofollow noreferrer">This example</a> of how to use UpdateContentType was helpful too.</p> <p>I don't believe you will be able to do this with the out-of-the-box SharePoint services. You've verified from looking at stssoap.dll that this doesn't appear to work correctly. Another 'client'-style option is to use <a href="http://msdn.microsoft.com/en-us/library/ms480784.aspx" rel="nofollow noreferrer">RPC methods</a> but none appear to provide functionality for content types at all.</p> <p>The web services are <em>particularly</em> frustrating because this type of not-so-edge case regularly comes up. It is very rare that I consider using them because of the time wasting involved with their limitations.</p> <p>Do you have <strong>any option</strong> of deploying custom code to the server? You could develop this functionality using the object model and wrap it in your own custom web service (there is a <a href="http://msdn.microsoft.com/en-us/library/ms464040.aspx" rel="nofollow noreferrer">walkthrough here</a>) quite easily.</p> <p>Here is an example adapted from <a href="http://gabewishnie.blogspot.com/2007/01/updating-existing-content-types-in.html" rel="nofollow noreferrer">Gabe Wishnie</a> that does what you require:</p> <pre><code>SPContentType myContentType = myWeb.ContentTypes["myContentType"]; string internalName = myContentType.Fields["fieldToUpdate"].InternalName; myContentType.FieldLinks[internalName].Required = false; myContentType.Update(true); </code></pre> <p>Sorry this isn't more helpful but it's a common story when using the WSS 3.0 / SharePoint 2007 web services.</p>
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    1. COIt's essentially impossible for me to deploy code on the server, sadly, thus the quest to find a workaround. Ultimately, if no other methods are found, I'll have to drop this functionality altogether.
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