Solution : https://service.sap.com/sap/support/notes/338837 (SAP Service marketplace login required)
Key words : 
additional key words vl31, inbound deliveries/shipping notifications, create replenishment deliveries, stock transport order, stock transport orders, inbound delivery, purchase orders, replenishment delivery, calculated incorrectly, weights/volumes
Related Notes : 
       
| 510837 | |
| 413085 | Weight/volume in delivery from purchase order (Modification) | 
| 329345 | Copying weights and volumes from PO in inbound/outbound dely |