Solution : https://service.sap.com/sap/support/notes/368011 (SAP Service marketplace login required)
Key words : 
currency/quantity field mcvbrp-vrkme, bwchange key figure 0inv_qty, standard field mcvbrp-fkimg, abap dictionary - include, source code corrections, component type fkimg, source code change, sample source code, i_xmcvbrp-posar = 'a', move i_xmcvbrp-fkimg
Related Notes : 
       
| 365922 | Incorrect update of value-only items in billing document | 
| 328181 | Changes to extraction structures in Customizing Cockpit | 
| 314486 | FSD: Billing document does not remove sales order | 
| 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 | 
| 123534 | SIS: Quantity update for milestone invoices |