When trying to create a UI policy for a catalog item, the "variable name" field (catalog_variable') will only present a blank drop-down menu, resulting in our inability to create the required conditions.
The Catalog Item field (catalog_item) is missing from the Catalog UI Policy Action form.
To solve the issue:
1. go to catalog_ui_policy_action table and open any record
2. Right-click on the form header
3. Go to configure> form layout
4. add the "catalog item" field to the form