CodeWatch Item Properties

I am trying to set the compile properties to generate a disk listing when I compile using CodeWatch.

When I try to update the L option, I receive the following:

What do I need to change to be able to select 'Yes'?  The Workspace default is blank; the Compiler default is 'No'; when I enter 'Yes' in Custom, I receive 

Thank you for your assistance,

Linda Praed

If you choose the Custom option, then what you place in the text box is the directory path where you want the listing.  The ... button to the right allows you to browse to a directory.