Hi, After reading DB-API 2.0 spec, it is not clear for me which Error class should be raised when trying to reuse a primary key. IntegrityError seems to be the best place but DataError could also be candidate. Your opinion ? Thanks -- Godefroid Chapelle BubbleNet sprl rue Victor Horta, 18 / 202 1348 Louvain-la-Neuve Belgium Tel + 32 (10) 459901 Mob + 32 (477) 363942 TVA 467 093 008 RC Niv 49849