http://blogs.msdn.com/abaturytski/archive/2007/06/20/using-empty-rule-in-work-item-type-definition.aspxIt turned out that the article about EMPTY rule in work item type definition XML is incomplete. It doesn't say one very important thing: EMPTY rule not only clears content of the field, but also makes the field read only. If your work item type uses aen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/abaturytski/archive/2007/06/20/using-empty-rule-in-work-item-type-definition.aspx#3443353Thu, 21 Jun 2007 16:23:39 GMT91d46819-8472-40ad-a661-2c78acb4018c:3443353Team System News<p>Brian Keller on New Team Test Case Studies: Hotmail.com and &quot;March Madness&quot;. Roy Osherove on Get latest...</p>