Solution : https://service.sap.com/sap/support/notes/328895 (SAP Service marketplace login required)
Key words : 
codepage sapdeveloped ambiguous sap blended codepages, ambiguous sap blendedcodepage special project, multi display / multi processing codepage, components ofthe entire system landscape, multi display / single processing codepage, heretraditional codepage means standard codepage, disadvantage compared tosingle codepage system, user anduser data language environment, sap developed sap blended codepage, codepage butsingle byte katakana
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