Solution : https://service.sap.com/sap/support/notes/715192 (SAP Service marketplace login required)
Key words : 
img -> production -> basic data -> bill, related application areas ->     define alternative determination, determination involves alternative determination, related application areas, material -> alternative determination, tc04-cslid reason, subcontracting purchase order, wrong selection id, alternative determination, define order
Related Notes : 
       
| 550219 | FAQ: Subcontracting in the material requirements planning | 
| 458606 | FAQ: Subcontracting in purchasing |