You can lock planned dates and forecasted dates to protect them against update.
indicates an unlocked date, a locked (read-only) date.
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Click in any Planned cell to lock all planned dates of the plan.
To unlock the locked planned dates, click at any planned date.
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Select the milestone for that you want to lock the forecasted date.
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Click in the Forecasted cell.
To unlock a locked forecasted date, click next to the date.