Solution : https://service.sap.com/sap/support/notes/195490 (SAP Service marketplace login required)
Summary : 
      SAP Note clarifies issues around message 00 196 and CPJ Syslog entries due to incompatible GUI code page settings from SAPLogon or SAP_CODEPAGE environment variable, mainly from releases prior to R/3 4.6C. It elucidates how GUI code page is automatically selected post-4.6C leveraging the TCP0F database table which details system and frontend code pages along with languages. Enhancements or modifications in the TCP0F table must consider frontend type, system code page, language, and the corresponding frontend code page. This setup supports valid SAPGUI logon, handling special characters, and system to frontend communications across various platforms including Windows, Unix/Linux, Mac, and OS/2.
Key words : 
syscp  fetype   status          langu  fecp 6200   ms       customer entry  zh     8400 6200   ms       customer entry  ko     8500 6200   ms       customer entry  ja     8000 6200   ms       customer entry  zf     8300if, mac   apple macintosh     ms    microsoft windows     os2   ibm os/2     unx   unix/linux 3, customer entry, command line option /supportbit_off=auto_codepage, incorrect front end code page, create customer entries, automatic gui code page selection, additional command line arguments, microsoft front end, code page 6100 sap unification------------------------------
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