When a request is prepared by one user on behalf of another (that is, when the requester and the preparer are different), the notification is sent to the preparer, not the requester.

Ariba Buyer emails a notification message to a requester whenever an approver adds comments to a request. The message indicates who added the comments and when.

This is a courtesy message to inform you of the request's progress through the approval process; it does not require any action on your part.