ORA-29901
        Function underlying operator binding does not exist.
        
        
        Cause
        Attempted to invoke an operator binding in a query and the underlying PL/SQL function was invalid or does not exist.
        Action
        Verify that the function corresponding to the operator invocation exists and is in a valid state.
        
     
    
    
        ORA-29901
        function underlying operator binding does not exist
        
        
        Cause
        The function underlying the operator binding does not exist.
        Action
        Ensure that the function corresponding to the operator invocation exists.
        
     
    
    
        ORA-29901
        function underlying operator binding does not exist
        
        
        Cause
        The function underlying the operator binding does not exist.
        Action
        Ensure that the function corresponding to the operator invocation exists.