Solution : https://service.sap.com/sap/support/notes/501303 (SAP Service marketplace login required)
Key words : 
terms shared master data tool, shared master data tool, attached correction removes, process simple boms, posting material boms, material boms, multiple boms, ale processing, create idocs, transaction bd21
Related Notes : 
       
| 545676 | FAQ BOM data transfer | 
| 115784 | ALE: ALE distribution of multiple BOMs |