stock-logistics-warehouse/stock_available/views/product_product_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record model="ir.ui.view" id="view_stock_available_tree_variant">
            <field name="name">Quantity available to promise (variant tree)</field>
            <field name="model">product.product</field>
            <field name="inherit_id" ref="stock.view_stock_product_tree"/>
            <field name="arch" type="xml">
                <data>
                    <tree position="attributes">
                        <attribute name="colors">red:immediately_usable_qty&lt;0;blue:immediately_usable_qty&gt;=0 and state in ('draft', 'end', 'obsolete');black:immediately_usable_qty&gt;=0 and state not in ('draft', 'end', 'obsolete')</attribute>
                    </tree>
                       <field name="virtual_available" position="after">
                       <field name="immediately_usable_qty" />
                    </field>
                </data>
            </field>
        </record>
    </data>
</openerp>