Dear all

We are developing a financial business application that contains hundreds of business rules for validations and calculations. In the calculation rules we change the value of attribute if values past in the request is incorrect e.g. 

rule "TaxCalc"
    when
         $i : Invoice()
         Invoice (totalTax != (round(salesTax + (gstRate * salesAmount / 100) + importDuty – govtRebate, 2)))
    then
         i.setTotalTax(round(salesTax + (gstRate * salesAmount / 100) + importDuty – govtRebate, 2));
end

The above code works perfectly fine. Only problem is the perform calculation twice. What I was looking if possible I can store calculated tax in a variable and simply assign variable to attribute if rule condiation fails. Some thing like:

rule "TaxCalc"
    when
        $i : Invoice()
        Invoice (totalTax != calTax : (round(salesTax + (gstRate * salesAmount / 100)+ importDuty – govtRebate, 2)))
    then
        i.setTotalTax(calTax);
    end

But this does not work - shows system error at calculated value assignment. Is there any work around?

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