User restriction to access another local repository

Hi All,

I have created two local repository.  I have created two users (X,Y).

When i trying to log in both users are able to access both repositories.

But i would like to restrict like X user should access only his repository, and same like Y user should access only his repository. They should not access different repository.

I am able to checking in CMC but no luck, kindly provide the exact step how to restrict the user to access another repository.

Thanks

Selvam