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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