errors with CREATE SYNONYM procedure

I've developed a procedure that will create a public synonym on an object, which I'd eventually like to call from a ddl "after create on schema" trigger.

But I'm first working on this piece - I get an INSUFFICIENT PRIVILEGES error
(ORA-1031) on the EXECUTE IMMEDIATE line. The user running the proc has
both DBA role and specifically the CREATE ANY SYNONYM procedure, which should be enough. I can create the synonym manually from SQL*Plus, but never through this proc . . . any ideas?

thx

here's the code, which compiles perfectly:

CREATE OR REPLACE procedure CREATE_GRANTS (

	p_lwowner varchar2,
	p_objname varchar2,
	p_objtype varchar2) AS

pragma autonomous_transaction;

v_lwowner varchar2(30) := p_lwowner;
v_objname varchar2(30) := p_objname;
v_objtype varchar2(30) := p_objtype;
v_sql varchar2(200);

begin
	v_sql := 'create public synonym ' || v_objname || ' for ' ||
v_lwowner || '.' || v_objname;
	execute immediate (v_sql);

end;
/

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