Essentially we make the following distinctions between bookings when displaying your revenue:
a) booking date (i.e. when you receive a booking)
b) event/service date (i.e. when you deliver the service or organize the event the customer has already paid for)
In the Calendar monthly view, option b) is displayed, and all vouchers are summed up based on the date. Reservations that have not yet been converted into an order are also included in the total sum of the calendar view. Reservations are included in the export of orders/services only once they have been definitively converted into an order.
Option a) is displayed in your bookingkit "Overview".
Why two different ways to summarize one and the same thing?
The graph in your Overview visualizes the total booking volume each day. This way vouchers are displayed twice, once as the revenue from the purchase of the voucher itself and once as the revenue from the appointment that the voucher was redeemed for.
If we were to record these sales only once the day the voucher was purchased, orders that were fully paid for with a voucher would be listed with 0 € revenue. The same would apply if you grant a 100% discount to a customer, essentially meaning a free experience. This could be quite misleading, which is why we chose such logic.