Solution : https://service.sap.com/sap/support/notes/314486 (SAP Service marketplace login required)
Key words : 
additional key words sis, symptom orders, cash management, billing document, statistics update, problem occurs, implement note 210330, /3 support package, quantities, prerequisites
Related Notes : 
       
| 373139 | Billing document: Quantity update of value items | 
| 368011 | SIS/BW: Statistics update for value items, quantities | 
| 210330 | Statistics update for value items | 
| 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 |