Solution : https://service.sap.com/sap/support/notes/91389 (SAP Service marketplace login required)
Key words : 
additional key words component supplier processing, actual symptom exists, jit delivery schedule, component suppliers -, delivery schedule, source code, incoming orders, scheduling agreements, slight improvement, xx releases
Related Notes : 
       
| 204130 | SIS update: Collective note | 
| 129470 | Incoming orders for component suppliers: Alternative update | 
| 125763 | SIS: Collective note - component supplier | 
| 109189 | SIS comp. supplier:Incoming order may be too high | 
| 81335 | Incoming order for sched. agreements not correct |