Hi ,
The configuration you are using to setup qListForm to have a SI Field display values returned from a operation that takes a parameter value based on a Choice field input is correct. Based on my debugging, It seems that a NULL is being passed as catalog parameter even when the Choice column has a valid parameter selected and Auto-postback is enabled, and as a result there are no matching results. We will investigate this further and look into providing a fix for this defect. Could you let us know what kind of environment you have and which version of the product you are using?
Thanks,
Yuan