ExactOnlineAPI API error [Code: 500, Response: { "error": { "code": "", "message": { "lang": "", "value": "Niet toegestaan: Valuta" } } }]

(Translation: "Not allowed: Currency")

Your connected Exact Online account is missing certain necessary configuration.

Make sure that you have the correct settings in Exact Online to book in currency. Select the journal you want to enter and make sure that Variable: Currency is checked.