Circular Reference Warning One or more formulas contain a circular reference and may not calculate correctly. Circular references ...

Circular Reference Warning  One or more formulas contain a circular reference and may not calculate correctly. Circular references are any references within a formula that depend upon the results of that same formula. For example, a cell that refers to its own value or a cell that refers to another cell which depends on the original cell's value both contain circular references.  For more information about understanding, finding, and removing circular references, click OK. If you want to create a circular reference, click Cancel to continue.