Updating Voucher
To be able to have the option to update the voucher for existing reservations. Unfortunately, if you're looking to update the voucher you need to cancel the reservation and create new once as there is no way to update voucher, only when creating initial booking.

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Mariann Ravbjerg commented
Good point! We are using the vouchers for statistical purposes and therefore are forced to cancel and create new if a error is made. So much better with the option to change this field as well.