batch process for completion status

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Has anyone ever tried and been successful in using the batch process functionality to change the completion status of a course?  I have a number of users that all need their completion status changed on a particular course and thought I would give it a try.  So I went to Completion Status under the User menu, selected my course, selected my users and then in the batch process area put in the necessary information.  When I clicked on the "Change Status" button I received an error message that read "You must select at least one user."  There are no