To receive a PO in NS follow the below steps
**Shipping & Receiving—Inbound Shipments—Inbound Shipment Details
Filter to PBG 1-6 (If it doesn’t default) Find the Inbound Shipment you want to receive. Select
Once you open the Inbound shipment record, select the “RECEIVE” button
Verify the qty received, if correct add the location, if incorrect change accordingly
Save
To view list of INBOUND with reference to PO Number:
On your dashboard, fast links under Warehouse Management
Filter, if Necessary
*If you click EDIT/VIEW against this screen it takes you to the inbound shipment build. This is not where you can receive- this is how SCM edits the order
If Looking for Inbound shipment number via PO:
Pull up the PO number in the system
View against the line item the inbound shipment number 
Once you identify the inbound shipment number, follow the above steps