granted table with select but procedure doesn't work

I have one table granted with SELECT - so I can access the table with select..

I can also create copy of this table with:

CREATE TABLE my_table AS
SELECT *
FROM read_only_tbl;

And also manualy reloadtable ->

DELETE FROM my_table;
INSERT INTO my_table
SELECT *
FROM read_only_tbl;

But when I want to run the "reload" from procedure it gives me an error while compiling that the procedure can't see the "read_only_table"...

CREATE OR REPLACE PROCEDURE prcd_reload AS
BEGIN

    DELETE FROM my_table;
    INSERT INTO my_table
    SELECT *
    FROM read_only_tbl;

   /*** .. rest of code ***/

END;
/

-> PL/SQL: ORA-00942: table or view does not exist

what grant do I need to access that table in procedure?

via Chebli Mohamed