Define exchange rate tables categorized by name i.e.
It is possible to define as many exchange rate tables as you wish to reflect during calculation of costs.
One exchange rate table contains currency exchange rates i.e. in future, now or in the past.
You can define i.e. worst, expected and best exchange rate scenarios that shall be used during calculation of costs.
You can create different Rate names if you e.g. want to compare the costs based on different exchange rates.