Hi,

I found these below in Odoo 12 source code and I don't really understand which model will be use: "mail.activity.type" or "hr.expense.sheet".

And we should use it in which situation? Thank you!

<record id="mail_activity_type_action_config_hr_expense" model="ir.actions.act_window">
    <field name="name">Activity Types</field>
    <field name="res_model">mail.activity.type</field>
    <field name="view_type">form</field>
    <field name="view_mode">tree,form</field>
    <field name="domain">['|', ('res_model_id', '=', False), ('res_model_id.model', '=', 'hr.expense.sheet')]</field>
    <field name="context">{'default_res_model': 'hr.expense.sheet'}</field>
</record>