input parameter: text and key value

Dear all,

I have a report with a DataSource based on a universe.

This universe has 1 input parameter with an associated list of values:

When I create query on my universe in IDT I get the following list:

But when I use this universe in Design Studio I get:

How can this now be changed so that Text if filled with the text of my LOV?

Kind regards,

Lieselot