Solution : https://service.sap.com/sap/support/notes/161862 (SAP Service marketplace login required)
Key words : 
additional key words statistics, note corrects note 158877, attached advance correction, sd document item, smaller document numbers, partial billing dates, sales document, billing plan, billing documents, partial invoices
Related Notes : 
       
| 303606 | Billing plan and text items | 
| 204130 | SIS update: Collective note | 
| 174141 | SIS: Collective note - Customizing | 
| 158877 | Down payment requ.prev.quant.transf. to CO/statcs. | 
| 113347 | Down payment process. as of Release 4.0x (standard) |