How to show Position ID in UI

Summary:

Hello Experts,

We're currently facing a business need to display the Person ID, Assignment ID, and Position ID within Employment.

We've successfully displayed the first two through TDS, but incorporating the third has proven to be more challenging.

Our approach has been to introduce a custom segment within the assignment DFF, utilizing a table value set with the SQL based on the person_id parameter.

Despite this, we're not seeing any results reflected in the UI.

The SQL appears to be correct, as the data model yields the anticipated outcome.

Can you provide some insights into what/where the issue might be?