Can you explain when can an entity's functional currency be changed?

Functional currency of an entity reflects the transactions, events, and conditions under which the entity operates and conducts its business. Ones the functional currency has been decided, it does not change. A functional currency should only be changed if there is a change in the nature of underlying transactions, events, and relevant conditions.

When there is a change in the functional currency it should be applied from the date of change. The change should be accounted for prospectively instead of retrospectively. The change in functional currency must be linked to a change in the underlying conditions and transactions. For example, a change in the major market may result in a change in the currency that affects the selling prices.