If you cancel a summary invoice, all normal invoices on it will be released. A summary invoice can only be cancelled until it has been adjusted payments. If payments have been adjusted to the summary invoice, you first need to cancel the adjustments to be able to cancel the summary invoice.

In case a summary invoice is cancelled, and a customer needs a document of it, a summary invoice with a status cancelled can be printed as a credit invoice and sent to the customer. The Send and Print functions on the ribbon create a copy of the cancelled summary invoice with a "Credit Invoice" text.