ORA-904 from query over database link

Hi All

I'm trying to select a function across a db link but I'm gettting an error:

SQL> select mdwrpod.FNC_INTERMEDIARY_KEY@acrm.read (0084533) from dual;
select mdwrpod.FNC_INTERMEDIARY_KEY@acrm.read (0084533) from dual
       *
ERROR at line 1:
ORA-00904: "MDWRPOD"."FNC_INTERMEDIARY_KEY": invalid identifier

I have read the docs on Metalink and tried the workaround but still have the same problem.

SQL> alter session set events '10176 trace name context forever';

Session altered.

SQL> alter system flush shared_pool;

System altered.

Is my syntax correct?

Thanks,

Charlton