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------- Additional comments from [EMAIL PROTECTED] Thu Mar 20 19:09:55 +0000 
2008 -------
Do we really need the formula to be blocked from working at all? What about
presenting a dialogue box at the time the formula is entered (e.g. "This formula
may contain an error as it multiplies the contents of two cells which are
formatted as currency. Edit formula / Ignore warning / Help"), or putting on an
error warning note in the same way that Excel does for e.g. inconsistent 
formulas?

There is a flaw in saying that e.g. currency * currency is always invalid.

currency * currency / currency ought to be valid (it could be used e.g. in
various rescaling calculations) so therefore by extension the (yucky!) (currency
* currency) / currency ought to be as well.

Moreover currency * currency / 1.48 ought to be valid if the 1.48 really refers
to a currency. That would be bad spreadsheet design (the 1.48 ought to entered
into a cell formatted as currency and then referenced in the formula) but for
example students who are just starting to learn how to use Spreadsheets (I teach
a lot of them!) often progress gradually from entering formulas without
references (e.g. "=2.12*3.57/1.48") to formulas that consist entirely of
references, via formulas that contain partly numbers and partly cell references.

Using data typing (especially of currencies) to IDENTIFY potential errors is a
fantastic idea!! But while it should warn users of the strong possibility of an
error I do not believe the formula should be invalidated.

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