Solution : https://service.sap.com/sap/support/notes/794411 (SAP Service marketplace login required)
Key words : 
unambiguous blended codepages6230  sap asian unification, ascii4102  utf-16 big endian                                          unicode4103  utf-16, code                                                            encodingpage  short description                                          charset------------------------------------------------------------------------, endian                                      unicode8000  shift-jis, ascii6240  sap asian unification, ascii6250  sap asian unification, korean + shift-jis level 1, greek + shift-jis level 1, thai + shift-jis level 1, cyrillic + shift-jis level 1
Related Notes : 
       
| 1319517 | Unicode Collection Note | 
| 975768 | Deprecation of Java features with non-Unicode Backend | 
| 938738 | Syslog CP6: still using ambiguous blended code page | 
| 938737 | Syslog CP6: still using blended code page | 
| 745030 | MDMP - Unicode Interfaces: Solution Overview | 
| 549268 | SAP JCo 2.x release and support strategy | 
| 73606 | Supported Languages and Code Pages |