Invoice submission

• For purchases sent from SAP Ariba, the quickest and easiest way to submit invoices is via the Ariba Business Network. If you are not already signed up to this free network, please use the link that was sent with the Purchase Order. If you use the network, please do not send any further copies of invoices unless requested. 

  • How to submIt a services invoice via the SAP Ariba Business Network (guidance document)
  • How to submit a goods invoice via the SAP Ariba Business Network (guidance document)

• For all other invoices, these MUST include a valid Purchase Order number and be sent in machine readable PDF format to APInvoices@open.ac.uk.

• IMPORTANT : Please do not send paper copies or email to any other OU e-mail address as this will delay payment.

• ANY Invoice submitted WITHOUT a valid Purchase Order number maybe returned to the supplier unpaid.

Invoice payment terms

• For correctly tendered invoices, The Open University’s standard payment terms are 30 days from invoice date.
• For any invoice or payment queries, email FBS-AccountsPayable@open.ac.uk or call +44 01908 653955.