Solution : https://service.sap.com/sap/support/notes/434666 (SAP Service marketplace login required)
Key words : 
600 piecesdelivery schedule 2 - release date 01/03delivery schedule 1, 500 piecesdelivery schedule 3 - release date 01/05delivery schedule 1, delivery schedule 1 - release date 01/02delivery schedule 1, individual delivery schedule schedule lines, delivery schedule date vblb-abrdt_org, cumulative delivered quantity reached, kwmeng solution note 81335 describes, current delivery schedule date, 100 piecesdelivery schedule 1 -> delivery schedule 2, delivery schedule 2 -> delivery schedule 3
Related Notes : 
       
| 499783 | Updating KWMENG & KBMENG in ODS with scheduling agreements | 
| 453024 | SIS:Setup of statistical data updates from 2 dely schedules | 
| 138458 | Incoming orders: Component supplier: Alternative update | 
| 81335 | Incoming order for sched. agreements not correct |