Purchase Order Finally Closed

Team, I need to know why a Purchase Order shipment allows to finally close when the shipment is received into receiving cloud. All the time we have issue with it. You can't deliver. You can't cycle count . You can return, correction infact nothing you can do if it is in cloud and the corresponding document is finally closed. ASCP workbench also shows PO in receiving . I understand we can't reopen a finally closed OR cancelled document and there is no data fix available to it.

Question:

1- Why system allows to finally closed when the shipment is not deliver. Is the condition satisfy if open quantity received into receiving .