Notes are not appearing when approving PR through API

We are using the below APIs to approve "purchase requisition", PRs are getting approved successfully but the "Notes" are not appearing in action history screen (neither in iProcurement screen nor in requisition summary form).

wf_notification.setattrtext (nid => p_notification_id,

aname => 'RESULT',

avalue => p_action

);

wf_notification.respond (nid => p_notification_id,

respond_comment => p_comments,

responder => lv_responser

);