When reviewing the milestones and tasks, you might accidentally approve a milestone. If this happens, you can easily unapprove it by selecting the milestone you wish to unapprove and click the Unapprove Milestone button on the top right of the middle section.
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After the milestone is unapproved, the milestone and tasks will go back to in review and the unapproval will show as an event in the Milestone Feed.
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