Solution : https://service.sap.com/sap/support/notes/388542 (SAP Service marketplace login required)
Key words : 
delivery schedule line mcvbel, additional key words lieferservice_erstellen, sapkh46c14 solution implement, corrections/notes required, batch split items, batch split, attached corrections, updated correctly, business warehouse, program error
Related Notes : 
       
| 610135 | Incorrect MCVBEL-VSMNG_L update (III) | 
| 381612 | Incorrect update MCVBEL-VSMNG_L | 
| 356986 | Scheduling agreement for compnent suppliers: Error in update | 
| 204130 | SIS update: Collective note | 
| 125763 | SIS: Collective note - component supplier |