Using cRIO slot 8 as a digital module?

Is it possible to use this slot as a digital module? Java doesn’t seem to like it, however, is it competition legal/possible?

The slots are defined by the FPGA image. They won’t work any other way.

You must have an analog module in slot 1 <R66>. You may have a second analog module in slot 2.

You must have a digital module in slot 4 <r59>. You may have a second digital module in slot 6.

You may have pneumatic modules in slot 7 or 8.