ORA-28154
        proxy user may not act as client 'user_name'
        - user_name: The proxy client user name.
        Cause
        A proxy user attempted to assume the identity of a privileged user in order to limit the privileges that a proxy may possess.
        Action
        Call the statement again specifying a client other than a privileged user.
        
     
    
    
        ORA-28154
        Proxy user may not act as client 'string'
        
        
        Cause
        A proxy user may not assume the identity of a privileged user in order to limit the privileges that a proxy may possess.
        Action
        Execute the statement again specify a client other than a privileged user.
        
     
    
    
        ORA-28154
        Proxy user may not act as client 'string'
        
        
        Cause
        A proxy user may not assume the identity of a privileged user in order to limit the privileges that a proxy may possess.
        Action
        Execute the statement again specify a client other than a privileged user.