Can't find a default operator class for type 1296.

This occured when I was creating a table:

---------------snip-----------------------------------------------
CREATE TABLE kurse (
wkn text NOT NULL,
datum timestamp NOT NULL,
ausg float4,
rueckn float4,
zg float4,
aussch float4,
PRIMARY KEY (wkn,datum)
);
NOTICE: CREATE TABLE/PRIMARY KEY will create implicit index 'kurse_pkey' for table 'kurse'
ERROR: Can't find a default operator class for type 1296.
wp=> SELECT version();
version
-------------------------------------------------------------
PostgreSQL 6.5.3 on i686-pc-linux-gnu, compiled by gcc 2.95.2
(1 row)
---------------snip-----------------------------------------------

Changing 'datum' to type datetime helps, but datetime is deprecated in
PostgreSQL 7.0.

Does this work in 7.0 beta?

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