Solution : https://service.sap.com/sap/support/notes/309381 (SAP Service marketplace login required)
Key words : 
prerequisites rpcifm41 -> cluster_keyrpcifm42 -> initialise_program, secundary file information, export temse file, unused coding, interface toolbox, unnecessary effort, ims maintanace, released internally, read_i532bsecundary_file -> replaced, upload_file -> replaced
Related Notes : 
       
| 329622 | Additions: Upgrading to Basis 4.6C SR1 (NDI upgrade) | 
| 327285 | Additions to upgrade to 4.6C SR1 | 
| 192949 | Additional info for upgrade to 4.6C | 
| 122597 | Ignoring errors in the phase XPRAS_... |