I have to admit that I never saw this web dynpro thing for POs before. Lets do some brainstorming.
I can't believe that SAP is just replacing the term GR for goods receipt and IR for invoice receipt with GM open IE open.
But sure they replace names all over at anytime, and it could mean goods movement (GM) and invoice entry (IE), but is this really so? is there any docu?
I see in the lowest screenshot that 1.3.3 External PO - Search is highlighted, I assume that is the search you executed.
I would understand this search 1.3.3 is used to search for any PO, while 1.3.2 above says External PO open searches only for open POs. Is my understanding right, and do you get a different result using the 1.3.2 search?
I further see that the PO listed is just the PO and does not show any item reference, so I guess it is related to the overall status (though is not yet understandable why it is open).
Then I see a button Open purchase order and Post Goods receipt above your result.
What does this button do? Does it filter the result for open purchase orders? Or does it take you to another transaction to maintain the PO or to post the goods receipt?
If you have not yet posted an invoice, then of course is the PO open, even it is completely delivered. This also means that the GR/IR account is not cleared. (it is cleared either with an invoice receipt, or with an invoice receipt and a subsequently MR11 if there was a difference)
Can it be that the status GM/IE just tells you this fact?