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If at least one night of the Member's stay is consumed with the use of HHonors Rewards Points, the entire stay is considered a "Reward Stay" and no HHonors Points may be earned, except that if Member is using Room Upgrade Rewards, any money spent on the original reservation will earn points and/or miles consistent with these Terms.
http://hhonors3.hilton.com/en/terms/...rual_of_points