If you do not use dsedit to edit the sql.ini file, you must run the ECDA related execution scripts to change the local version of sql.ini (located in <install_dir>\DC-15_0\connectivity\ini\sql.ini) to the global version. The global versions are at:
For ECDA Option for ODBC, in:
<install_dir>\DC-15_0\ini\sql.ini
For ECDA Option for Oracle, in:
<install_dir>\DC-15_0\ini\sql.ini