If you invoice through Conference Manager and need to cancel an order and issue a credit note, you can do this directly in the system.
How to do it:
Go to Participants → Order list. Click on the order number for the specific order. In the Order details overview, click Cancel order. In the new window, select Deregistered participants shall not pay, and then click Confirm.
The system will now issue a credit note, which can be viewed in the order’s Order details under the Invoice overview tab.
Did you accidentally select Deregistered participants must still pay instead of Deregistered participants shall not pay while cancelling an order? Learn how to fix it here.