How to modify the email notification for the Requisition Approval Notification in REQAPPRV.wft

Hello

I have requirement to modify the Requisition Approval Notification and i did the VO extension to have the additional fields on the notification (can be seen from the worklist) and now to change the email approval notification i found the the workflow is REQAPPRV and the message is  PO_REQ_APPROVE_SIMPLE_JRAD. I opened the workflow and opened the process "Parallel Approval Subprocess" which have this notification and i found the attribute name REQ_LINES_FWK_RN in the message body but I did not able to found this attribute in PO_WF_REQ_NOTIFICATION package. Can anybody help me how to modify the email approval notification?