Solution : https://service.sap.com/sap/support/notes/92665 (SAP Service marketplace login required)
Key words : 
directory ~ftp/general/r3server/patches/rel40b/, directories /usr/sap/put/exe, /usr/sap/put/tools, additional key words upgrade, customer-independent screens, corrected r3trans reports, actual upgrade, missing screens, executable r3trans, program r3trans
Related Notes : 
       
| 202169 | Additional Info: Upgrade to 4.6C - DB2/400 | 
| 178823 | Additional Information: Upgrade to 4.6B - DB2/400 | 
| 162117 | Additional Information: Upgrade to 4.6A - DB2/400 | 
| 141661 | Additional Info: Upgrading to 4.5B DB2/400 | 
| 108377 | Additional Info: Upgrading to 4.5A DB2/400 | 
| 99379 | Additional Info: Upgrading to 4.0B DB2/400 | 
| 91709 | Addition upgrade to 4.0B | 
| 19466 | Downloading SAP kernel patches |