This field is controlled by local menu and can take the following values: current exchange rate/monthly exchange rate/average exchange rate.
The exchange rate type proposed by default is the exchange rate type associated with the supplier entered in the order header. As long as the order has not been created, it can be modified except when a line with a cost structure has already been entered.
An exchange rate type is used to determine the currency exchange rate in the exchange rate table taking into account the order date. This information is used to determine the prices and discounts on the basis of the price lists authorizing the conversion between currencies.
If order lines have been entered, or during the copy of an order, a question will be posed to the user about whether to re-calculate the prices and discounts depending on the price lists. If the user decides not to apply the price lists, the prices and discounts will be simply converted into the new currency at the rate determined by the exchange rate type and the order date.
If the currency is equal to the company currency, the exchange rate type will not be accessible since it will have no influence in this context.