reopen or attach a file to PO after closing

reopen or attach a file to PO after closing

I would like to know first, is it possible to reopen a PO?
What if it was accidently marked as every item was received (which closes the PO) and then we discover one item was missing from the shipment?

Second, I would like to know if I can attach a document/file to a PO after it has been closed? Like say a packing slip from the delivery.


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