The following bug has been logged online:

Bug reference:      4023
Logged by:          Giovani Murilo Dantas Correa
Email address:      [EMAIL PROTECTED]
PostgreSQL version: 8.3.0 and 8.1.9
Operating system:   Linux 2.6.X (Slackware and Fedora)
Description:        The transaction control does not work for sequences
Details: 

create sequence seq_test;
select nextval('seq_test'); --return value 1
select nextval('seq_test'); --return value 2
select nextval('seq_test'); --return value 3
BEGIN;
select nextval('seq_test'); --return value 4
select nextval('seq_test'); --return value 5
select nextval('seq_test'); --return value 6
ROLLBACK;
select currval('seq_test'); --return value 6

This is not right. The currval must have be 3 and not 6.

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