Voici la solution:
Le problème traversait ids dans les tableaux de commande si magento mélangé tous les articles.toutes les tables de commande:
TRUNCATE sales_order
; TRUNCATE sales_order_datetime
; TRUNCATE sales_order_decimal
; TRUNCATE sales_order_entity
; TRUNCATE sales_order_entity_datetime
; TRUNCATE sales_order_entity_decimal
; TRUNCATE sales_order_entity_int
; TRUNCATE sales_order_entity_text
; TRUNCATE sales_order_entity_varchar
; TRUNCATE sales_order_int
; TRUNCATE sales_order_text
; TRONCAT sales_order_tax
; TRUNCATE sales_order_varchar
; TRUNCATE sendfriend_log
; TRUNCATE tag
; TRUNCATE tag_relation
; TRUNCATE tag_summary
; TRUNCATE wishlist
; TRUNCATE log_quote
; TRUNCATE report_event
;
TRUNCATE sales_flat_quote
; TRUNCATE sales_flat_quote_address
; TRUNCATE sales_flat_quote_address_item
; TRUNCATE sales_flat_quote_item
; TRUNCATE sales_flat_quote_item_option
; TRUNCATE sales_flat_quote_payment
; TRUNCATE sales_flat_quote_shipping_rate
; TRUNCATE sales_flat_order_item
;
ALTER TABLE sales_order
AUTO_INCREMENT = 1; ALTER TABLE sales_order_datetime
AUTO_INCREMENT = 1; ALTER TABLE sales_order_decimal
AUTO_INCREMENT = 1; ALTER TABLE sales_order_entity
AUTO_INCREMENT = 1; ALTER TABLE sales_order_entity_datetime
AUTO_INCREMENT = 1; ALTER TABLE sales_order_entity_decimal
AUTO_INCREMENT = 1; ALTER TABLE sales_order_entity_int
AUTO_INCREMENT = 1; ALTER TABLE sales_order_entity_text
AUTO_INCREMENT = 1; ALTER TABLE sales_order_entity_varchar
AUTO_INCREMENT = 1; ALTER TABLE sales_order_int
AUTO_INCREMENT = 1; ALTER TABLE sales_order_text
AUTO_INCREMENT = 1; ALTER TABLE sales_order_tax
AUTO_INCREMENT = 1; ALTER TABLE sales_order_varchar
AUTO_INCREMENT = 1; ALTER TABLE sendfriend_log
AUTO_INCREMENT = 1; ALTER TABLE tag
AUTO_INCREMENT = 1; ALTER TABLE tag_relation
AUTO_INCREMENT = 1; ALTER TABLE tag_summary
AUTO_INCREMENT = 1; ALTER TABLE wishlist
AUTO_INCREMENT = 1; ALTER TABLE log_quote
AUTO_INCREMENT = 1; ALTER TABLE report_event
AUTO_INCREMENT = 1;
ALTER TABLE sales_flat_quote
AUTO_INCREMENT = 1; ALTER TABLE sales_flat_quote_address
AUTO_INCREMENT = 1; ALTER TABLE sales_flat_quote_address_item
AUTO_INCREMENT = 1; ALTER TABLE sales_flat_quote_item
AUTO_INCREMENT = 1; ALTER TABLE sales_flat_quote_item_option
AUTO_INCREMENT = 1; ALTER TABLE sales_flat_quote_payment
AUTO_INCREMENT = 1; ALTER TABLE sales_flat_quote_shipping_rate
AUTO_INCREMENT = 1; ALTER TABLE sales_flat_order_item
AUTO_INCREMENT = 1;