https://userapps.support.sap.com/sap/support/knowledge/en/3568568
3568568 - Purchase Requisition appears partially received in Ariba Guided Buying, despite receipts...
You create a purchase requisition (PR) in Ariba with multiple line items and send it to S4; then, you create individual purchase orders (POs) for each line...
ariba guided buyingpurchase requisition