Solution : https://service.sap.com/sap/support/notes/119159 (SAP Service marketplace login required)
Key words : 
additional key words unbw, resulting lower-level order, assembly produced directly, collective order, superior order, material type, system asks, settlement rule, automatic rule, solution correct
Related Notes : 
       
| 136365 | Settlement rule for non-valuated material | 
| 115995 | Collective order with material type 'nonvaluated' | 
| 63601 | Production order for non-valuated material |