JDBC Receiver - Language problem

Dear Experts,

    I have a proxy to JDBC scenario (PI 7.11) in which the data contains fields for 15 different languages. But only for languages Greek and Russia the data which is inserting into the table is showing special characters ("???").

    I had kept log sql statement in the channel and the data is showing correct in the log.

    Unicode is enabled in ECC SM59. But still getting the same.

    Please give your valuable inputs.

Thanks

Ravi