Solution : https://service.sap.com/sap/support/notes/118880 (SAP Service marketplace login required)
Key words : 
additional key words component supplier processing, release schedule line, jit delivery schedule, component suppliers, delivery schedule, implement note 109189, scheduling agreements, changed quantity, existed prior, incoming order
Related Notes : 
       
| 204130 | SIS update: Collective note | 
| 130342 | Incoming orders not deleted when doc. deleted | 
| 129470 | Incoming orders for component suppliers: Alternative update | 
| 125763 | SIS: Collective note - component supplier | 
| 121509 | Comp.suppl.proc.: Open delivery qties incorrect | 
| 109671 | Incorrect stock determination after item deleted | 
| 109189 | SIS comp. supplier:Incoming order may be too high | 
| 92361 | Sched.agrmnts open qty/credit value in sched.lines |