An updated invoice is triggered as soon as a factor relevant to the invoice changes.

That includes:

• Amount changes (except if the invoice amount falls to zero)
• Billing-relevant address changes
• Change of e-mail address (relevant billing e-mail address)
• Change an invoice (= cancellation of the original invoice and creation of the new adjusted invoice)
• Change of invoice type; from e-mail to paper invoice (an additional CHF3.- will be charged, which changes the invoice amount)