Need to disable access of some users to a module in JDE

Hello Team ,

We have 52 users identified which have the access to HCM module .But these users are not using the HCM module .Can some help on this ?

What are the way to deregister any user from any module, say HCM? Is it through role based access to report/application?

Is it that the access is through some role and when we disable the role , the access to module gets automatically disabled .

if so then how can i find the role that when disabled can serve my purpose .

Regards,

AMeet