Sending Japanese Character From XI to SAP 4.6C

Dear Expert,

I have a requirement here to send Japanese character from web application --> XI --> IDOC(in 4.6C).

However, it always fail, and I could only see garbage character.

I have tried the suggestion to put the logon language as JA in the RFC destination, but it is not working.

Please kindly help with your suggestion.

Thank you very much.

Best Regards,

Y