BUG with decimal type

Hi,

sorry if this is already fixed, but under Postgres 6.5.1. (debian 6.5.1-6)
the following ..

create table VAT (
objectid integer not null primary key,
ts integer not null,
vatlevel decimal(18,2) not null,
orderby integer not null
);
create unique index VAT_level_idx on VAT ( vatlevel );

.. yields:

"ERROR: Can't find a default operator class for type 1700."

Regards,

--
Jens Glaser Am Holderstrauch 13, 36041 Fulda, 0661/9429507 jens(at)jens(dot)de