QUOTE
We need you to create a new knowledge module
This reads like a homework or work assignment given to you verbatim. Have you done any research on this issue yourself yet?
Also, the question you're posing sounds like a development issue. I see you posted the question at
http://forums.oracle.com/forums/thread.jspa?threadID=985176 on the Oracle ODI forums. I would await an answer there and do some research of your own; a quick google search shows others with character conversion problems.
We do have some notes on data integration at
http://www.dba-oracle.com/t_database_integration_tips.htm, but it sounds like you're looking for something specific.