For connecting IBM DB2 OS 400 with QlikView, you need to install iSeries Access ODBC Driver v12.64.
version may differ but this one is the most stable. ask this from your client.
Other drivers to connect with QlikView are;
- IBM DB2 ODBC Driver
- Client Access ODBC Driver v12.64
Also, you can refer to Qlik help for connecting to IBM DB2
Hope this will help you.
Ahmed Ali Shiraz