Special characters could create some issues with Control-M Server.
That problem exist since the first version of Control-M and it will be better to be carefull with the current version.
Of course it will be better to do same update on Control-M and Control-EM servers.
Following scripts downloadable from that site, contain SQL scripts to replace all bad character with a correct. (example ? by e...)
There are tow scripts running under Unix with version 6.1.03.
To Control-M Server database character-test.sh
To Control-EM Server database character-test-em.sh