Solution : https://service.sap.com/sap/support/notes/167138 (SAP Service marketplace login required)
Key words :
menu 'development' -> 'programming environment' -> 'messages', call transaction se91 directly, select 'tools' -> abap/4 workbench2, additional key words afs, maintained afs additional data, afs material <-> standard material, afs data deleted, afs master data, component size entries, select individual maintenance
Related Notes :
| 337062 | BOM maintenance - grid of not yet valid component |
| 190743 | Msg 8J964 in change to dimension in BOM |
| 168887 | AFS V1.0D2 Fixpack #5 including HP/LCP 27-31 |