How to set up BPM notifications to PO requesters when an invoice is on hold

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Hi

 

I am struggling with setting up BPM Worklist notifications to be sent to the requester when an invoice is on hold. I have been able to navigate to the attached screen, however I am lost as to what fields to put in and where to go from here.

I want to get a notification sent to the PO requester when their invoice is on hold for being a) receipted over/under the tolerance and b)invoice over/under the tolerance. 

This will be useful so they can then take an action on this and know what to do. Please can somebody assist me