How to make the submit button unclickable when a Repeating Group is empty?

Hello.
The RG-V is a repeating Group where I add Villes (cities)".

If the other fields are empty the button “Submit” is not clickable, it is ok.
But it is not the case if there is no lines in the RG.

I’ve try differents path.
But I don’t know how to link my result on the fact that the button must not be clickable.

image

Thanks

In the conditions, check if repeating groups:first item is empty

Thank @reger-alexander :slight_smile:

André