How to set and update exchange rate for purchase order

When we create a new purchase (Purchases -> Purchase Orders -> Add) and select a vendor, the system will withdraw the predefined currency used by the vendor.

For each purchase, you need to enter the exchange rate of the given currency. We enter by entering the exchange rate at a given moment in the "Exchange rate" field. The system does not withdraw this information automatically, but it is necessary to enter it manually for each purchase because exchange rates can occur on a daily basis.