Solution : https://service.sap.com/sap/support/notes/100996 (SAP Service marketplace login required)
Summary : 
      
Key words : 
additional key words alternative items, source code corrections, usage probability, transaction ck11, program error, solution carry, attached correction, program mc64mf0s, lines marked, prerequisites
Related Notes : 
       
| 149332 | Error for material components with usage probability 0 | 
| 115011 | CK11: Usage probability for alternatives | 
| 74859 | Costing: Alternative items with wrong quantity | 
| 74062 | BOM explosion; Usage probability | 
| 73960 | BOM explosion; Usage probability |