Hi guys, I'm trying to add a button in the activities page and I set class="_kanban_small_column o_opportunity_kanban" create="1" and it works, but when I click on "create" it gives me an error because the model_name is not present, how can I add it in the code:

<kanban default_group_by="activity_type_id" class="_kanban_small_column o_opportunity_kanban" create="1" _order="date_deadline" group_create="false" group_delete="false" model_name="res.partner" group_edit="false">

<field name="user_id"/>

<field name="res_id"/>

<field name="res_name"/>

<field name="res_partner_id"/>

<field name="res_model"/>

<field name="contact_partner_id"/>

....

Thanks