Solution : https://service.sap.com/sap/support/notes/97610 (SAP Service marketplace login required)
Key words : 
additional key words mcvr, attached advance corrections, fields mcvbap-netwr, mcvbap-kwmeng, schedule agreements, update simulation, database entries, scheduling agreement, program error, implement note 75030
Related Notes : 
       
| 204130 | SIS update: Collective note | 
| 125763 | SIS: Collective note - component supplier | 
| 75030 | Billing schedule: Stats reorg. and simulation |