Hi Luca:
I reached out to Sundar Kamakshisundaram concerning your question. Guidance can vary depending on a number of factors, so it is best for you to work directly with your BPO team or with the relationship manager. Sundar hosts the Direct Material Sourcing group, which is a private collaboration group at Ariba Exchange. This is another resource you can leverage to get input on future questions about this topic.
Regards,
Debbie Curtis-Magley
Ariba Exchange Community Manager