ORA-01927: cannot REVOKE privileges you did not grant

Hi,

I am trying to revoke select grant on single table from a user(RO_APPS) but getting error message. Tried with apps,applsys and sys all are giving same error.

Also this user has "Select any table" grant.

SQL> revoke select on applsys.WF_NOTIFICATION_ATTRIBUTES from ro_apps;

revoke select on applsys.WF_NOTIFICATION_ATTRIBUTES from ro_apps

*

ERROR at line 1:

ORA-01927: cannot REVOKE privileges you did not grant

RO_APPS has below grants:

-- 1 Role for RO_APPS

  GRANT CONNECT TO RO_APPS;

  ALTER USER RO_APPS DEFAULT ROLE ALL;

  -- 1 System Privilege for RO_APPS

  GRANT SELECT ANY TABLE TO RO_APPS;