Resolution:
Symptom
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When BC is sending responder request to private process, Latin character Ñ is transformed into "Ã?"

Analysis
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BC is sends messages using UTF-8 encoding.  If your BW 5 project's encoding is not set to UTF-8, the character will be corrupted.
    

Resolution
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Save the BW project using UTF-8 encoding and use the new saved project.

Here are the steps:
    Open your project using BW designer
    From the menu select "Project"-->"Save As"
    Select a new Directory and change Encoding to UTF-8
    Click OK
    Use newly saved project