Solution : https://service.sap.com/sap/support/notes/128362 (SAP Service marketplace login required)
Key words : 
component suppliers fields mcvbap-brgew, incoming order statistics, requested delivery quantity, additional key words, mcvbap-ntgew, mcvbap-volum, mcvbap-lsmeng, mcvbap-kbmeng, mcvbap-klmeng, program error
Related Notes : 
       
| 204130 | SIS update: Collective note | 
| 125763 | SIS: Collective note - component supplier | 
| 81335 | Incoming order for sched. agreements not correct |