Solution : https://service.sap.com/sap/support/notes/85363 (SAP Service marketplace login required)
Key words : 
convert japanese single-byte katakana, recommend applying support packages listed, apply correct upper case conversion, contact component xx-rc, support package listplease apply, sapkb46c40 downloading source files, ~general/r3server/abap/note, 46bonly source code files, database scan tool rsi18n_search, single-byte katakana
Related Notes : 
       
| 432115 | AIX 4.3.2 and non-latin-1 ISO8859 languages | 
| 328895 | Brief information on language combination on R/3 | 
| 158774 | Incorrect case mappings in some locales | 
| 75825 | Changing the character set in the existing system | 
| 73606 | Supported Languages and Code Pages |