Pass logged in username / userid to Job Requisition Approval Notification

Summary:

We have a requirement to customize Job Requisition Approval Template and add certain fields to it. Some of the field will only be visible depending on the logged in User's Grade.

As the notification data model does not have USER_NAME or USER_ID as a parameter we tried to get the user_name using the :XDO_USER_NAME parameter in the BIP report. The value returns a valid user_name when the notifcation query is run from Reports and Analytics, but when the same report is called via the 'See How it is going' link on top of Job requisition page to see the requisition approval status the value od :XDO_USER_NAME paremeter is being returned as NULL. due to this we are not able to display fields selectively to the users.