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When you set a task to 0% or 100% complete, the actual work will beset to 0 hours (0h) or the total amount of work, even though you cleared the "Updating task status updates resource status" check box on the Calculation tab in the Options dialog box. (On the Tools menu, click Options.)
This problem occurs because Microsoft Project recalculates a task set to 0% or 100% complete and updates the status of the task. In contrast, Microsoft Project 95 only recalculates a task set to 100% complete.
Microsoft Project 2000 Standard Edition, Microsoft Project 98 Standard Edition, Microsoft Office Project Professional 2007, Microsoft Office Project Professional 2003, Microsoft Office Project Standard 2007, Microsoft Office Project Standard 2003, Microsoft Project 2002 Standard Edition, Microsoft Project 2002 Professional Edition, Microsoft Project Professional 2010, Microsoft Project Standard 2010