Solution : https://service.sap.com/sap/support/notes/688218 (SAP Service marketplace login required)
Key words :
system displays message v1596, suitable main item increment, items ared added, item increment, terms v1596, item number, sales order, sort component & -, structure reason, itemno_before + itemno_afterwards
Related Notes :
| 1606757 | LORD: Message V1 596 missing in the log |
| 774347 | Collective SAP note: BOMs |