How do I enable generating PDF copies of all invoices, so that my company's ERP system will receive the invoice PDF copy as an attachment in the invoice cXML?

Have your Designated Support Contact (DSC) contact SAP Ariba Customer Support to enable the entitlement Generate an invoice copy as PDF attachment to the invoice.

The invoice cXML will change to include the PDF copy in a format similar to the following (where abc represents the content ID):

<InvoiceDetailRequestHeader>
<Extrinsic name="invoicePDF">
<Attachment><URL>cid:abc</URL></Attachment>
</Extrinsic>
</InvoiceDetailRequestHeader>

SAP Business Network for Procurement & Supply Chain > Transaction Documents