Solution : https://service.sap.com/sap/support/notes/210330 (SAP Service marketplace login required)
Key words : 
additional key words sis, sales order, billing document, statistics update, problem occurs, affected areas, delivery note, note 145701 corrected, implement note 123534, implement note 314486
Related Notes : 
       
| 373139 | Billing document: Quantity update of value items | 
| 368011 | SIS/BW: Statistics update for value items, quantities | 
| 314486 | FSD: Billing document does not remove sales order | 
| 204130 | SIS update: Collective note | 
| 197769 | Statistics update for value items | 
| 174141 | SIS: Collective note - Customizing | 
| 166092 | No update to the SIS for services | 
| 145701 | Statistics update for value items | 
| 123534 | SIS: Quantity update for milestone invoices |