Solution : https://service.sap.com/sap/support/notes/64695 (SAP Service marketplace login required)
Key words : 
additional key words vl04, cumulate future schedule lines, minor standard correction existed, form routine lips_fuellen_aus_vbep, schedule lines due, jit delivery schedule, supplying scheduling agreements, correction proposal listed, collective delivery processing, schedule lines
Related Notes : 
       
| 137937 | SD scheduling agreement: Delivery split for each schedule li | 
| 98783 | All schedule lines delivered at the same time | 
| 64453 | Comp.supplier: Wrong SD document indices and reqs |