You cannot edit the formula for a calculated item while custom calculation is used.

在使用自定义计算时不能编辑计算项公式。

youdao

The final currency conversion difference, the balance item, is calculated and booked using the rules in the general configuration.

最终的货币转换差异（余额项）通过一般配置中的规则计算并登账。

youdao

I have experienced a case where the price for a shopping cart item was calculated in an Enterprise Resource Planning (erp) system, item by item.

我曾经历过这样一个情况，在企业资源计划(ERP)系统中，购物车里条目的价钱逐个地计算。

youdao

If an item is subject to sales tax in the state to which the order is shipped, tax is generally calculated on the total selling price of each individual item.

FORBES: Confused By Amazon Taxes? You're Not Alone