Conrad, while you are working on the circular reference problem, it might be good to know that there is a way to make Excel accept circular references. Just go to Tools\Options\Calculation(?) (Extra\Opties\Berekenen) and check Iteration (Iteratie). You probably won't need to change the iteration values.
To debug a circular reference, you select the problem cell and then you choose Tools\Check(?) (Extra\Controleren) and then the option to point to source and/or target cells.
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