Solution : https://service.sap.com/sap/support/notes/940761 (SAP Service marketplace login required)
Key words :
main item categoryunder spro->crm->transactions->basic settings->define item categories, main item', create delivery group, propose delivery group, terms delivery group, delivery group, delivery groups, sales order, crmd_order reason, program error
Related Notes :
| 1223257 | Changes not transferred to delivery group schedule line |
| 957838 | Delivery group is reset by the system automatically |