The summary invoice has its own reference number. When importing payments from a bank software as reference material, the customer’s payment is directly adjusted to the summary invoice. You can also adjust a payment to the summary invoice manually:

1. In the Summary Invoices folder select a summary invoice and Adjust Payment on the ribbon.
2. The window that opens is identical to the one for a normal invoice.
   
3. Enter all necessary information and save and close the window.
4. If the customer paid the summary invoice entirely, the status of the summary invoice, as well as the normal invoices will change to paid.
5. If the customer did not pay the full amount, the system will adjust the payment for the normal invoices from oldest to newest.
   • If necessary, print the summary invoice again according to the current receivables and send it to the customer.
   • In case the remaining amount will not be charged from the customer, either refund it or register it as a credit loss through the normal invoices on a summary invoice. These functions are not enabled directly to the summary invoice.

You can also adjust payments to normal invoices for example in the Financial Management > Invoices folder. When all normal invoices on the summary invoice have been adjusted with a full payment, the summary invoice will also get a status paid.