Ashok,
My understand of issue: - UFT-8 JMS to JMS sometimes work. Good.
But sometimes it fails. Where does it fail?
If messages fail in graphical mapping, read my blog. Post the input file screenshot in notepad++.
FYI... UFT-8 can encode all know characters (some 1,114,112). ASCII can encode 256 characters.
Always try to use UTF-8. There are no "special characters". Spanish character are like any-other characters.
Open the files with Notepad++ or some good editor which first decodes characters in UFT-8 like foxe (and fallback on some other encoding).