Advance invoices can be created before the conclusion of an event, if down payments or advance payments by the customer need to be posted.

1. Create an item "Advance payment" (or such) without price or other details in the item group "Other".
2. Right-click on  Invoices and select  Add > New advance invoice.
3. Enter a unique name for the invoice segment.
4. Click on New and add the "Advance payment" as booked item. Enter the amount as price and a count of "1".
5.  Save your input by clicking on the icon in the top left-hand corner of the input window.