Nope, you are not missing anything. The Bose speaker systems all depend on the 'bass module' (it's not really a subwoofer). Just connect the bass module to the front speaker terminals of the receiver and the satellites to the bass module.
Set the front speakers in the receiver to Large and Subwoofer to No. The receiver will then send the full range signal to the bass module which will play the bass portion and send the rest to the connected satellites.