[pg-sql] - Problem with duplicate table (PostgreSQL 7.2.3

I have to duplicate a table to save different instances of datas.
 Structure de la table "spectacle"  
-------------------------------------------------------- */ 
CREATE TABLE "spectacle" (  id_spectacle SERIAL,   "id_membre_adherent" INTEGER NOT NULL,   "id_genre_festival"
INTEGER,  "id_festival" INTEGER,   "nom" VARCHAR(255),   "compagnie_interprete" VARCHAR(255),   "vitaculture" INTEGER
NOTNULL,   "regionales" INTEGER NOT NULL,   "presentation" TEXT,   "genre_precision" VARCHAR(255),   "duree"
VARCHAR(255),  "photo1" VARCHAR(255),   "photo1_credit" VARCHAR(255),   "photo2" VARCHAR(255),   "photo2_credit"
VARCHAR(255),  "salle" TEXT,   "tarifs" TEXT,   "id_traitement" INTEGER DEFAULT 1,   "distribution" TEXT,
"type_public"VARCHAR(255),   PRIMARY KEY("id_spectacle"),   FOREIGN KEY ("id_festival") REFERENCES
"festival"("id_festival") ON DELETE RESTRICT  ON UPDATE RESTRICT  NOT DEFERRABLE,   FOREIGN KEY ("id_genre_festival")
REFERENCES
 
"genre_festival"("id_genre_festival")  ON DELETE RESTRICT  ON UPDATE RESTRICT  NOT DEFERRABLE,   FOREIGN KEY
("id_membre_adherent")REFERENCES 
 
"membre_adherent"("id_membre_adherent")  ON DELETE CASCADE  ON UPDATE RESTRICT  NOT DEFERRABLE,   FOREIGN KEY
("id_traitement")REFERENCES "traitement"("id_traitement")  ON DELETE RESTRICT  ON UPDATE RESTRICT  NOT DEFERRABLE 
 
) WITH OIDS; 
CREATE INDEX "adherant_spectacle_fk" ON "spectacle" 
USING btree ("id_membre_adherent"); 
CREATE INDEX "genre_spectacle_fk" ON "spectacle" 
USING btree ("id_genre_festival"); 
CREATE INDEX "spectacle_au_festival_fk" ON "spectacle" 
USING btree ("id_festival");


When I duplicate this code in an other table named spectacle_v without 
Foreygn key ... all is running.

But when I try to delete a spectacle_membre, linked value in spectacle 
are correctly deleted, but I have an error for spectacle_v which is not 
linked :

(ERROR: referential integrity violation - key in membre_adherent still 
referenced from spectacle_v )

I do not understand this message error, because any foreign key is 
referenced with this table.