If an invoice has already been sent for a settlement, but it later turns out that this settlement is incorrect, you can send a correction invoice for the same invoicing period.
Creating a correction invoice
Go to settlements in the owners module. Open the settlement you wish to correct by clicking on the total amount. Use the 'Recalculate' button to ensure that the settlement contains the correct reservations and amounts. Then click 'Create concept correction invoice'.
Once the correction invoice has been created, you will see that its total takes into account the amounts that were already on the first, incorrect invoice. Both invoices must therefore be paid for correctly balanced accounting.
You cannot undo a correction invoice. If it is also incorrect, you have to create a new correction invoice.