Cross Site Lookup and Parent Site Lookup

At many instances, we look for having a centralized master list that can be accessed across all SharePoint sites. We end up writing custom code to do that or in 2010, try and use the Enterprise Managed Metadata functionality.

However, giving access for users to update this and also have them available as a picker in the Lists and Libraries is a challenge.

CodePlex / Dev4Side have the Filtered Lookup which can be used to access a Master List in the parent site from subsites
http://dev4side.com/projects/sharepoint-2010-filtered-lookup-field.aspx

I tried this on my SP 2010 environment and it works fine, just ensure, you do an IISReset after Adding and Deploying this solution.

One caveat though: if you try to customize a SharePoint list using InfoPath with this field in it, it is not going to work :)

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