After you use the Undo command, a cell value that you changed may not return to its previous value.
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This behavior occurs when the cell contains dependencies or formulas
that require recalculations. This behavior may occur in the following
cases.
Case 1
When a cell is dependent on another cell for a value, Microsoft Excel may not update the dependency dynamically until it is forced to do so. Undoing an entry that is a precedent to another cell does not force the link to update to its previous value.
Case 2
When you turn on manual calculation, link one cell to another, and then use
the Undo command, Excel does not force the link to update to its
previous value.
Case 3
When a cell contains a formula that uses a function that refers to another
cell (for example, the RAND function), the cell does not revert back to its
previous value when you use the Undo command to undo the value of its precedent.
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
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Microsoft Excel allows 16 levels of undo operations. You can reverse an
action by clicking Undo on the Edit menu or by clicking the Undo button on the Standard toolbar.
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