サンプルスクリプト
async function onChange(forpage,oldVal,newVal,executeOnLoad){
if(executeOnLoad){
return;
}
var item_cost = current.Job.getValue(current.Layout.Fields.<select-Item-cost-parameter-こちら>.id);
var tax = current.Job.getValue(current.Layout.Fields.<select-Tax-parameter-こちら>.id);
var freight = current.Job.getValue(current.Layout.Fields.<select-Freight-charges-parameter-こちら>.id);
var total = item_cost.value + tax.value + freight.value;
current.Job.setValue(current.Layout.Fields.<select-Total-cost-parameter-こちら>.id, total);
}