You can deactivate an individual user account on the RMB 

A background task runs at the end of each day to check whether the activate/deactivate dates have passed.

What are you trying to do via the event?

The event is needed for security requirement possibly to prevent certain transactions.

Still none the wiser 

What will trigger the event?

This would be impossible without some custom code. An event action runs as the end user, and most end users aren’t going to have permission to deactivate users, even themselves.

As a word of warning, a deactivated user is deactivated everywhere and can no longer work without IT intervention to reactivate them, even if they only made a mistake. To put that more bluntly, you can’t make money without working employees.

I added some protection to ensure your app owner and other system accounts don’t get locked.

I didn’t test this.

SET SQLBLANKLINES ON

CREATE OR REPLACE PACKAGE c_deactivate_user_api AUTHID DEFINER IS
/*
module_  CONSTANT VARCHAR2(25) := 'FNDBAS';
lu_name_ CONSTANT VARCHAR2(25) := 'CDeactivateUser';
These comments get read by DATABASE_SYS. DO NOT REMOVE.
*/
PROCEDURE init;

PROCEDURE deactivate_current_user;

END c_deactivate_user_api;
/

CREATE OR REPLACE PACKAGE BODY c_deactivate_user_api IS

PROCEDURE init IS BEGIN NULL; END init;

PROCEDURE deactivate_current_user
IS
   attr_       VARCHAR2(32767);
   objid_      fnd_user.objid%TYPE;
   objversion_ fnd_user.objversion%TYPE;
   info_       VARCHAR2(32767);
BEGIN
   IF fnd_session_api.get_fnd_user != fnd_session_api.get_app_owner
      AND fnd_session_api.get_fnd_user NOT LIKE 'IFS%'
   THEN
      SELECT objid, objversion
        INTO objid_, objversion_
        FROM fnd_user
       WHERE identity = fnd_session_api.get_fnd_user;
      client_sys.clear_attr(attr_);
      client_sys.add_to_attr('ACTIVE', 'FALSE', attr_);
      fnd_user_api.modify__(info_, objid_ objversion_, attr_, 'DO');
   END IF;
END deactivate_current_user;

END c_deactivate_user_api;
/

GRANT EXECUTE ON c_deactivate_user_api TO ifssys;

EXEC dictionary_sys.rebuild_dictionary_storage_(0, 'PACKAGES');

EXEC security_sys.grant_package('C_DEACTIVATE_USER_API', 'FND_ENDUSER');

EXEC security_sys.refresh_active_list__(0);

Your event action would then call…

BEGIN
   IF /* some very naughty thing is being attempted */ 1=0 THEN
      c_deactivate_user_api.deactivate_current_user;
   END IF;
END;

Thank you, this is probably not wise to use an event. Thank you for the input.

Yes, and I believe you’re allowed to mark your own response as the best answer.