You have opportunities that have values in multiple currencies.

 In Dynamics 365 Sales, currency exchange rates are applied to opportunity records when specific triggers occur. These exchange rates are updated manually on a periodic basis (e.g., once a month) to reflect current currency values.

 Exchange rates are recalculated for an opportunity when there is a change in the status reason (e.g., from open to won or lost). This trigger ensures that the most recent exchange rate is used when key changes occur in the opportunity lifecycle, maintaining accurate currency reporting.