pos/pos_container/views/container.xml

<odoo>
    <record id="pos_container_tree_view" model="ir.ui.view">
      <field name="name">pos.container.tree</field>
      <field name="model">pos.container</field>
      <field name="arch" type="xml">
        <tree>
          <field name="name"/>
          <field name="barcode"/>
          <field name="weight"/>
        </tree>
      </field>
    </record>
    
    <record id="pos_container_form_view" model="ir.ui.view">
      <field name="name">pos.container.form</field>
      <field name="model">pos.container</field>
      <field name="arch" type="xml">
        <form>
          <sheet>
            <group>
              <field name="name"/>
              <field name="barcode"/>
              <field name="weight"/>
            </group>
          </sheet>
        </form>
      </field>
    </record>

    <record id="pos_container_action_window" model="ir.actions.act_window" >
      <field name="name">Containers</field>
      <field name="res_model">pos.container</field>
      <field name="view_mode">tree,form</field>
    </record>

    <menuitem id="pos_container_menu"
              name="Containers"
              parent="point_of_sale.pos_config_menu_catalog"
              sequence="13"
              action="pos_container_action_window"
              groups="point_of_sale.group_pos_manager,point_of_sale.group_pos_user"
              />
</odoo>