Hello, I´m working on a product which contains custom data in a list of multiple dictionaries. How can I save the list/dictionaries after changes? Persistence is enabled (and works for other types), and "_p_changed" is set, also get_transaction().commit() is called. A second problem is that multiple instances of the product reference the same list. So if I change the list of one of the instances the other changes, too. The list and dictionaries are stored in a class variable(in the product) and not global. Thanks, Arndt. _______________________________________________________________________ DV electric ad@dvelectric.com http://www.dvelectric.com Fon 0221/2725782 Fax 0221/2725783 Burgmauer 20, 50667 Köln _______________________________________________________________________