Solution : https://service.sap.com/sap/support/notes/626273 (SAP Service marketplace login required)
Key words :
sales order header field, sales order header reason, 'determine default values' button, sales order header, sales order item, existing schedule lines, default values automatically, changing customer group, default values, automatic default
Related Notes :
| 621676 | Composite SAP note for Cable Solution - V46C.1A Fix Pack 5 |