rule which unpredictable modify a sequence number

[Armand Turpel <geocontexter@xxxxxxxxx>]

I have a problem with a rule which unpredictable modify a sequence
number. When I add a new table entry, the new id_keyword hasnt the value
as expected. ex.: 1000000000000000, 1000000000000001,
1000000000000002,...... If i remove the rule it works.

Here the table, rule and sequence definitions:

CREATE TABLE geocontexter.gc_keyword(
  id_keyword bigint NOT NULL DEFAULT nextval('geocontexter.seq_gc_keyword'::regclass),
  id_parent bigint NOT NULL DEFAULT 0,
  id_attribute_group bigint,
  id_status smallint NOT NULL DEFAULT 100,
  update_time timestamp without time zone NOT NULL,
  preferred_order smallint,
  lang character varying(30) NOT NULL DEFAULT 'en'::character varying,
  title character varying(126) NOT NULL,
  description character varying(10000) NOT NULL DEFAULT ''::character varying,
  attribute_value text,
  CONSTRAINT gc_keyword_id_keyword PRIMARY KEY (id_keyword)
)
WITH (
  OIDS=FALSE
);

CREATE OR REPLACE RULE keyword_insert_or_replace AS
    ON INSERT TO geocontexter.gc_keyword
   WHERE (EXISTS ( SELECT 1 FROM geocontexter.gc_keyword
                   WHERE gc_keyword.id_keyword = new.id_keyword))
   DO INSTEAD
          UPDATE geocontexter.gc_keyword SET lang = new.lang, description = new.description,
                                             title = new.title, update_time = new.update_time, id_parent = new.id_parent,
                                             preferred_order = new.preferred_order, id_attribute_group = new.id_attribute_group,
                                             attribute_value = new.attribute_value
          WHERE gc_keyword.id_keyword = new.id_keyword AND gc_keyword.update_time<   new.update_time;

CREATE SEQUENCE geocontexter.seq_gc_keyword
  INCREMENT 1
  MINVALUE -1999999999999999
  MAXVALUE 1999999999999999
  START           1000000000000000
  CACHE 1
  CYCLE;



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