Can you please (a) correct your link in web.sitemap (spelt incorrectly) and (b) make the helplink available.
It should read:
<siteMapNode url="/Admin/Store/ShippingEstimate.aspx" title="$resources:Common,ShippingEstimate" helplink="Online%20Help/Store%20Setup/Shipping%20Estimate.aspx"></siteMapNode>
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