When you insert a database component in the mapping tool, it may ask you to select the ODBC database driver to be used to establish the connection from the client computer:
If you wish to connect to a IBM i database, choose the IBM i Access ODBC Driver or an equivalent driver that provides access to IBM i databases. If you do not see this screen, and you need to select a different database driver, you can click the Edit Drivers button when you are asked to Select or Create a DSN.