Document Approval

Hi, We’ve configured the document approval system in NAV 5.0SP1 for POs and facing a problem. Approval notifications are getting generated (emails) for cancellations, delegations and rejections. No emails are getting generated when the PO’s get approved. Just wanted to know, whether the approval systems sends notifications (emails) by default to the person who sends the order for approval, when the approver approves the order. Pls help