AFC DBO Relate Question - Requisition and Purchase Order

Summary:

Hi, how do I join (what columns are key) the Requisition DBO and Purchase Order DBO to the Purchase Order Approval DBO? I'm trying to create a control that IDs the same person creating and approving the purchase requisition. Not sure if the purchase req approval data point is available so I may have to do same person created req and approved PO.

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