The following bug has been logged online:

Bug reference:      6054
Logged by:          Alex
Email address:      alexander.ochkal...@gmail.com
PostgreSQL version: 8.4.8
Operating system:   CentOS
Description:        Insert to table, which has fkey to table,which is
parenttable for another table - error
Details: 

CREATE TABLE t1 
(t1_id numeric(10,0) NOT NULL PRIMARY KEY);

CREATE TABLE t2
(t2_id numeric(10,0) NOT NULL PRIMARY KEY) INHERITS (t1);


CREATE TABLE t3
(t3_id numeric(10,0) NOT NULL PRIMARY KEY ,
t1_id numeric(10,0) NOT NULL REFERENCES t1(t1_id)) ;



INSERT INTO t2 VALUES(1,2);
INSERT INTO t3 VALUES(3,1);


ERROR:  insert or update on table "t3" violates ---
foreign key constraint "t3_t1_id_fkey"
     DETAIL:  Key (t1_id)=(1) is not present in table "t1".


BUT!!!! 
SELECT t1_id FROM t1 WHERE t1_id = 1;
-->1

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