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.

When someone explicitly adds a new approver to a request, Ariba Buyer emails a notification message to the requester. The message identifies the new approver and who added the approver.

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.