SQL & PL/SQL

Hi

I need to give SELECT grants to a role over a synonym but I got this error:

SQL> GRANT SELECT ON SYNERGIA.CoDato_SED TO ROLE_SYNERGIA;
GRANT SELECT ON SYNERGIA.CoDato_SED TO ROLE_SYNERGIA
*
ERROR at line 1:
ORA-02021: DDL operations are not allowed on a remote database


SYNERGIA.CoDato_SED is a synonym from a remote database create with this script:

CREATE SYNONYM SYNERGIA.CoDato_SED FOR TPS.CoDato_SED@BDEEDN.DSYN;

Please how can I deal with these situation.

Thanks.
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Database version: Oracle 9i 9.2.0.8.0
SO: hpux 11.23