Solution : https://service.sap.com/sap/support/notes/83501 (SAP Service marketplace login required)
Key words : 
additional key words xvbep_zuordnen, identical schedule line, 1h solution correct, sales document, change mode, original item, implemented note 68904, source code, error occurs, install note 68904
Related Notes : 
       
| 129470 | Incoming orders for component suppliers: Alternative update | 
| 109189 | SIS comp. supplier:Incoming order may be too high | 
| 101342 | Performance during rescheduling | 
| 68904 | Rescheduling in the sales order |