AD Login only for one usergroup

Hi!
I have a question according to the AD login on Suse Linux. I successfully configured the AD login, but at the moment every user, which can be found in the AD can login. My intention is that only members of a special group can login on the Suse Linux. How can I realize this, I do not think that it makes sense to configure a AD Group Policy.

I would we happy if someone can help me!

Florian