Call Package.Procedure from Other Procedure

A procedure F is created in a package P. The F can't be called in a procedure O which is not inside the package P. What should I pay attention.
Thanks you very much.

e.g.
create PACKAGE P as

    PROCEDURE F( inp_para varchar);
end P;
/

create PROCEDURE O is

    v varchar;
begin

    P.F( v );
-- error:- ORA-06550: line 19, column 4: end;
/
Received on Sat Jun 03 2000 - 00:00:00 CEST