To confirm, under PO Options on the Main tab, there are two options: 'Automatically Close Partially Received Purchase Orders' and 'Receipt Variance to Close Purchase Order Lines'. These settings will automate the closing process. However, regardless of these settings, a PO will become closed when the Qty Recd = Qty Inv and the Qty on BO =0. As long as both of these rules fail, the PO will remain open.