update_primary_key = False
        if 'form' in kw:
            form = kw['form']
            if 'old_key_value' in form:
                old_key_value = form['old_key_value']
                if old_key_value != key_value:
                    update_primary_key = True
                    ob = table_session.loadObject(old_key_value)
                    table_session.deleteObject(ob)
                    ob = self.table_session.getInstance()

        if not update_primary_key:
            ob = self.table_session.loadObject(key_value)