Solution : https://service.sap.com/sap/support/notes/502267 (SAP Service marketplace login required)
Key words : 
parameter-effective change number ecm1, parameter-effective change number ecm2, parameter-effective change number, parameter-effective change statuses, date-valid change statuses, corrections -> correction instructions, dead item reason, change number, change statuses, parameter effectivity
Related Notes : 
       
| 493961 | |
| 215970 | Bill of material: Delete dead items |