Hi,

I've got a tree view like this :

<record model="ir.ui.view" id="module_tree">
            <field name="name">module.tree</field>
            <field name="model">module</field>
            <field name="arch" type="xml">
                <tree string="Invoices" create="false" delete="false" edit="false">
                    <field name="partner_id" groups="base.group_user"/>
                    <field name="invoice_id"/>
                    <button name="look_invoice" string="" icon="gtk-go-forward" help="See invoice" type="object"/>
                </tree>
            </field>
        </record>

When i take out the button from the tree view, all display correctly. But if i put the button i've got this error :

Error: QWeb2 - template['TreeView']: Runtime Error: TypeError: dict.field.attrs.modifiers is undefined

My python function related to the button :

def look_invoice(self,cr,uid,ids,context=None):
        context = context or {}
        invoice_id = self.read(cr,uid, ids[0], ['invoice_id'])['invoice_id']
        if invoice_id:
            return {
                'type': 'ir.actions.act_window',
                'name': 'Invoice',
                'res_model': 'module',
                'res_id': invoice_id[0]
                'view_type': 'form',
                'view_mode': 'form',
                'nodestroy': True,
            }
        return False

Does somebody got any idea of where is the problem please ?