why "INSERT INTO ... SELECT" is concurrency conflicts with "CREATE TABLE"

Hi, Why is that the query INSERT INTO io__selection_top (id_navigateur) SELECT id_navigateur FROM bdm__index_client_cookies_id_navigateur; has a "COMMIT: transaction is aborted because of concurrency conflicts, will ROLLBACK instead" whith this query : DROP TABLE pierre; What is the table that a conflict ? SYS.TABLES ? Thanks Pierre -- 1G6 52 route de bischwiller 67300 Schiltigheim Société de Services et de Formations en Logiciels Libres http://1g6.biz Tél : 06 64 63 70 35 // 09 54 38 70 90