stock-logistics-warehouse/stock_inventory_chatter/data/stock_data.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        
        <!-- Stock-related subtypes for messaging / Chatter -->
        <record id="mt_inventory_canceled" model="mail.message.subtype">
            <field name="name">Inventory Canceled</field>
            <field name="res_model">stock.inventory</field>
            <field name="default" eval="False"/>
        </record>
        <record id="mt_inventory_confirmed" model="mail.message.subtype">
            <field name="name">Inventory Confirmed</field>
            <field name="res_model">stock.inventory</field>
            <field name="default" eval="False"/>
        </record>
        <record id="mt_inventory_done" model="mail.message.subtype">
            <field name="name">Inventory Done</field>
            <field name="res_model">stock.inventory</field>
            <field name="default" eval="False"/>
        </record>

    </data>
</openerp>