Something

CREATE OR REPLACE FUNCTION test_fnc(bigint)
  RETURNS int AS
$BODY$

BEGIN
	RAISE EXCEPTION 'This error is generated from stored function...';
	return 1;
END;
$BODY$
  LANGUAGE 'plpgsql' VOLATILE;
ALTER FUNCTION test_fnc(bigint) OWNER TO livechat;

CREATE OR REPLACE FUNCTION test_fnc2(bigint)
  RETURNS int AS
$BODY$

BEGIN
	perform test_fnc(1);
	return 2;
END;
$BODY$
  LANGUAGE 'plpgsql' VOLATILE;
ALTER FUNCTION test_fnc2(bigint) OWNER TO livechat;



select * from test_fnc2(1)