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。
The current value of the business metric - this could be a physical measure like Sales, a calculated measure like Profit, or a custom calculation defined specifically in the KPI.
业务方法的当前值——这可以是一个具体的衡量如销售，计算的衡量如利润，或者一个在KPI里特别的自定义计算。
Customers often need such items as custom reports and calculation logic. There are also cases where functionality such as Time Entry is not needed by all clients.
客户通常需要例如定制报表和计算逻辑等功能，但并不是每一个客户端都需要像Time Entry这样的功能。
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