Solution : https://service.sap.com/sap/support/notes/1564138 (SAP Service marketplace login required)
Key words : 
multi national language support, complex character representation, blended code page, single code page, native language support, mdmp system installation, language installation, support unicode, language combinations, -unicode system
Related Notes : 
       
| 1568702 | |
| 73606 | Supported Languages and Code Pages |