Solution : https://service.sap.com/sap/support/notes/115784 (SAP Service marketplace login required)
Key words : 
terms application link enabling, solution variant boms, post alternative bills, application log, multiple boms, predefined alternatives, relevant segments, system displays, error message, multiple bom
Related Notes : 
       
| 501303 | ALE: Transferring multiple BOMs | 
| 133301 |