Yes header status will be applicable to line, line locations and distributions.
Closed code: Once PO is received and invoiced if ICT and RCT is not 100%. Can be reopened.
Finally Closed: Manually or programatically enforced and can't be reopened.
We have a PO's which are FINALLY CLOSED. however the POs are showing up in the view RCV_CONFIRM_RECEIPT_V with status OPEN
Ideally these PO's should not show up in that view.