stock-logistics-warehouse/stock_available_unreserved/views/stock_quant_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>

        <record id="quant_search_view" model="ir.ui.view">
            <field name="name">stock.quant.search</field>
            <field name="model">stock.quant</field>
            <field name="inherit_id" ref="stock.quant_search_view"/>
            <field eval="10" name="priority"/>
            <field name="arch" type="xml">
                <field name="owner_id" position="after">
                    <field name="reservation_id"/>
                </field>
                <filter name="internal_loc" position="after">
                    <filter name='internal_unreserved'
                            string="Internal Unreserved"
                            domain="[('reservation_id','=', False), ('location_id.usage','=', 'internal')]"/>
                </filter>
            </field>
        </record>

        <record model="ir.actions.act_window"
                id="product_open_quants_unreserved">
            <field name="name">Stock On Hand (Unreserved)</field>
            <field name="context">{'search_default_internal_loc': 1, 'search_default_locationgroup':1}</field>
            <field name="domain">[('product_id', '=', active_id), ('reservation_id', '=', False)]</field>
            <field name="res_model">stock.quant</field>
        </record>

    </data>
</openerp>