Deprecation of Java features with non-Unicode Backend

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Symptom
You want to know why communication between Java components and SAP server backend systems are only supported if the backend system is a Unicode system despite note 794411 describes how code page conversion with JCo works in case of a non-Unicode backend.
Other terms
MDMP, Single Code Page, JCo, JRFC, code page conversion
Reason and Prerequisites
Technically, [...]