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How to change the look up field "Category" in Posts a required field

Posted By:      Posted Date: September 14, 2010    Points: 0   Category :SharePoint
This is for a SharePoint 2010 Blog site. Is it possible in SharePoint 2010 to change the look up field "Category" for Posts as a required field?  I can create a new look up field and specify that as a required field but don't have an option to make the column "Category" as required. 

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