https://userapps.support.sap.com/sap/support/knowledge/en/2663562
2663562 - Is it possible NOT to create an inbound delivery with service cXMLShipNoticeRequest_in ?...
You do not want to create inbound delivery (openable in VL03n) document with sending from Ariba ShipNoticeRequest to SAP ERP / S4Hana side.