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The selected base currency is used for calculating new deals. If you decide to change your base currency, old deals won't be recalculated and will be displayed using the previous base currency
Note: If you have already created transactions for your customer in your base currency, you will not be able to change the currency. In such a case, you can create a new customer with the desired currency and enable the option to allow duplicates for the display name
Choosing “Keep” for the default currency option under a particular language means the currency will remain the same when switching to that language. When a new currency is added it is included by default for all languages