Template error when addin history tab to partner kanban view

Hi I'm trying to show the 'History' tab on the partner Kanban view. To do that I created a new module with a *_view.xml file containing as follow: res.partner.history.info.formres.partner20False I also created a *.py file into the module folder containing the inheritance of the class res_partner: class res_partner(osv.osv): _inherit = 'res.partner' _columns = { 'invoice_ids': fields.one2many('account.invoice', 'partner_id', 'Invoices'), 'order_ids': fields.one2many('sale.order', 'partner_id', 'Invoices'), } When I go to a partner Kanban view, on the history Tab, I have nothing showed, even if I select a partner that has invoice. If I click on the expandable 'Description' row, I get the error `QWeb2 - template['ListView.row']: Runtime Error: Error: Unknown field state in domain [["state","not in",["draft"]]]` As I don't deal with `state` in the *view.xml file I don't understand how I come to this error. Thanks for your help Cheers