Solution : https://service.sap.com/sap/support/notes/683033 (SAP Service marketplace login required)
Key words : 
symptom transaction ck11n returns inexplicable results, terms ck11n reason, program error resulting, multi-level configuration, cost estimate, work continuously, top material, solution implement, attached correction, configuration
Related Notes : 
       
| 672566 | CK11N: Incorrect display for multi-level configuration | 
| 631062 | Configuration with individual requirements |