I reached out to the product team with your question. Here's the guidance offered:
"Vasco will know if he can take this action if he can 'Surrogate Bid' for the supplier from the suplliers tab in the RFI/RFP.He can also contact the Help Desk for assistance with this action. There are instances where some companies have policies that prevent employees from taking this action."
Ariba Exchange Community Manager
Thank you for the previous answer, however i still have one doubt.
Surrogate Bidders, according to the ariba help documentation, can only post bids for the suppliers. What i would like to know is if it is possible to respond to the content in a RFI ( some specific content questions) in behalf of my supplier?
Yes, surrogate bidding allows for entering the entire response, including responding to questions.