If you are talking about setting the printer up under Client Access, here are a couple of things you can try.
1.) Under File/Printer Setup, put a check mark next to use windows default printer.
2.) Under File/Printer Setup. Put a check mark next to use PDT. Then click on the select PDT button and select a PDT. If you can not find one for the Oki and it will support PCL then you can use one of the hppcl5.pdt.
These instructions are for Client Access V5R4.
If you are talking about setting this printer up as an outq on the i5, please post your outq configuration.