How To Use The OLEDB Command To Call A Oracle Function?

HI,

I want to use the OLEDB command to call a oracle function, but i havnt found any materials about how to do that, my oracle function is as below:

CREATE OR REPLACE function GET_ZONEID_FROM_SYFZ(ycz varchar2,xc varchar2,strat_id varchar2)
return varchar2 IS
 zone_id_result varchar2(10) ;
begin
 PKG_DM_DQ.GET_ZONEID_FROM_SYFZ(ycz,xc,strat_id,zone_id_result);
 return zone_id_result;
end;

In OLEDB command transformation component, i fill the sql command with "select GET_ZONEID_FROM_SYFZ(?,?,?) from dual", but i dont have it worked.

The error message is :provider can not derive parameter information and setparameterinfo has not been called.

Who have any idea about how to make it work?

Thanks ~~