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Upgrade to latest (4.1.49)
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Change Calculation Type as Custom and enable Tax Included.
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Create a new script and type handle as
Calculation_[CalculationTemplateName]
. If your calculation template name isService
it should beCalculation_Service
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Add this into Code area. Update 0.08 with your rate.
result = (Ticket.PSum + Ticket.PreSum - Ticket.Tax) * 0.08
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Have fun.
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