DSXchange

I used a UTF-8 encoded file (with Jap and Eng chars) for processing. Direct Mapping using a transformer works fine. But in sort, join or other collating activities the encoding gets lost and the output shows junk chars.
I used a JP NLS locale but the director showed the following warning:

main_program: No collation sequence found for ja_JP, falling back on locale ja

The result has the encoding lost. How to handle this? Should I modify the dsenv file?