Solution : https://service.sap.com/sap/support/notes/916748 (SAP Service marketplace login required)
Key words : 
fortrustedsys<number>=<bw_sid>, bipostinstallprocess template, template installer, automatic configuration, system sets, solution replace, <bw_client>
Related Notes : 
       
| 851251 | (Outdated) SAP NetWeaver 2004s Installation on UNIX | 
| 848950 | SAP NetWeaver 2004s Installation on Windows (Obsolete) |