SEPA - How invoices are created and edited

Invoices are created automatically 8 days before the due date > status: Scheduled.
In this point the invoices can be edited.

Invoices are automatically changed to a locked status 1 day beofe due date > status: Lastschrift nich heruntergeladen
In this point the invoices can't be edited anymore. All changes to the invoices should be done at least two days before the due date.

Note: the due date is the due date marked on the invoice. If the xml is sent to the bank too late, the due date might not be the actual day when the money is pulled out.