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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.