If you do not have a cash register module you can make an invoice. For this you go in the Harbor / passers menu to the section "To be invoiced bookings". Here you can find the relevant booking and click on the "Create invoice" button. The invoice is now created as .PDF (Adobe) and placed on your screen for printing.
For the boat price, the length * amount is usually calculated. Also the number of nights times the price per person. It is also possible that the tourist tax is automatically added if it automatically accompanies the calculation.
In the Passer by card you will see on the tab "Item" that the item lines have been invoiced.
