Solution : https://service.sap.com/sap/support/notes/1439009 (SAP Service marketplace login required)
Key words : 
transaction i18n ->trouble shooting ->ccc statics, 1100a        function rscpcconvert returned 0a, sap-internal artificial test programs, report code page conversion errors, aa  exception cx_sy_codepage_converter_init occurred, external components received idocs, code page converter cache, code page converter, source code page, 4103    target code page
Related Notes : 
       
| 447519 | Kernel patches for code pages, languages and locales |