How do I add a recurring purchase order number for my billing invoice?

Please follow the steps below after logging in:

1. Click [your initials] in the upper right hand corner
2. Click Service Subscriptions in the drop down menu
3. In the My Subscriptions tab, click Open Bills (average load time is 10 seconds)
4. Click the Update button below Recurrent PO-Number
5. Enter your purchase order (PO) number with an end date in the correct date format
6. Click the Update button
7. Click the paper icon to the right of the invoice to download a PDF copy. The PO number should be showing on page 1

Updating the recurring PO number is used for future invoices and also updates the PO numbers of all existing invoices.

SAP Business Network voor Procurement en Supply Chain > Abonnementskosten