Dependency between data interfaces

Hi there,

I'm a starter with PowerBI Desktop and I'm just trying to create a dependency between two data interaces. I would like to have one option field, where you can choose one radio button and depending on this decision, you can choose some options in the second data interface.

It nearly works already... There#s just one problem: It's possible to go both ways, but I would like to have it one way, so that you first have to choose the one data interface and after that, you can choose within the second data interface.

Thank you!

Nadine