Crystal Reports running totals

Message

     Trying to create a running total

1.         formula1 (Group Header)                 WhilePrintingRecords;CurrencyVar TaxDue; TaxDue:=0

2.         formula2 (Detail Section)                 WhilePrintingRecords;CurrencyVar TaxDue; TaxDue:= TaxDue + {@H}

3.         formula3 (Group Footer)                              WhilePrintingRecords;CurrencyVar TaxDue; TaxDue;

4.         @H  (Is a Group Calculated Total)  formula = {@F} * {@TR}

5.         I get an error when I try to Save and Close the formula

          "The remaining text does not appear to be part of the formula"
                WhilePrintingRecords; (From here on out it is highlighted) 