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* You can in general use either the name of the field within square brackets, or frm.cf_''customfieldid''.value to refer to the values for the calculations.
* In both cases is that the field must be visible on the page (or a [[Hidden Value]] custom field that is on the page).
* A [[Combo BoxesBox]] custom field can be used in mathematical as long as the stored value is numeric. The displayed value does not have to be numeric
* [[Check Boxes]] cannot normally be used in Calculated Value fields. (They can be accommodated with sufficient knowledge of JavaScript)