Please guide me where we can find in report “PO first approved date”.

Summary: Please guide me where we can find in report “PO first approved date”. Because the current reporting is completely wrong since it is always giving the “PO last approved date” but showing in header report "Approved date" without mentioning it is the ‘PO last approved date’. Since it is not clear hence confusing everyone and giving wrong impression or incorrect reading from “PR approved date” to “PO approved date”, while here the PO approved date = PO last approval date.