No problem. I wish I could have been more helpful but its better you get official notes from Ariba by submitting a service request on behalf of your customer/organization.
I found a very relevant document and I request you to go through the same and find some background to reach out to Ariba support with more specific questions
http://www.accenture.com/SiteCollectionDocuments/PDF/MajorPharmaceuticalCompany_Long.pdf
Regards
Vilas