Custom drop-down list is blank

Hello,

I've created a custom drop-down list in the WT03TSA1 (Stock Change Intersite) screen, but when trying to use it, none of the options are displayed. Instead, it says "No Match":

The menu is set up as follows:

The field is set up as follows:

There is no graphical object drop-down for list here either.

Any ideas?

Thank you,

Zoey