Solution : https://service.sap.com/sap/support/notes/101007 (SAP Service marketplace login required)
Key words : 
additional key words co01, simple discontinuation component receives, discontinuation component receives, simple discontinuation component, simple discontinuation components, material receives quantity 0, order header quantity, discontinuation component, simple discontinuation, receives quantity 0
Related Notes : 
       
| 139908 | Qtys of discontinued/follow-up mat. when changing hdr qty | 
| 79149 | Alternative UoM: Incorrect adjustment of comp. qties | 
| 73033 | Component quantity in production orders |