Remove all schema access rights to another schema

Hallo!I have 2 database schemas CKEUAT2 and CBKLPROD.CKEUAT2 can access tables of CBKLPROD since the select statement executed in CKEUAT2

SELECT * FROM CBKLPROD.smtb_current_users;

produces  results.I have tried to revoke CKEUAT2 from accessing smtb_current_users in CBKLPROD by  running the following revoke statement as SYS user

revoke all on CBKLPROD.smtb_current_users from CKEUAT2;

The output states that  revoke all succeeded but still the

SELECT * FROM CBKLPROD.smtb_current_users;

Works while in CKEUAT2.

How do I resolve this?Eventually I would like to revoke CKEUAT2 from accessing any object in  CBKLPROD.Please give an SQL statement that can do this.