sale_stock_availability/sale_view.xml

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

    <record model="ir.ui.view" id="view_order_stock_form">
        <field name="name">sale.order.form.inherit</field>
        <field name="model">sale.order</field>
        <field name="inherit_id" ref="sale.view_order_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='order_line']/tree/field[@name='product_uom_qty']" position="after">
                <field name="virtual_available_boolean" groups="sale_stock_availability.see_stock_boolean"/>
                <field name="virtual_available" groups="sale_stock_availability.see_stock_value"/>
            </xpath>
        
            <xpath expr="//field[@name='order_line']/form//label[@for='product_uos_qty']" position="before">
                <field name="virtual_available_boolean" groups="sale_stock_availability.see_stock_boolean" attrs="{'invisible':[('state','!=','draft')]}"/>
                <field name="virtual_available" groups="sale_stock_availability.see_stock_value" attrs="{'invisible':[('state','!=','draft')]}"/>
            </xpath>  
        </field>
    </record>

    </data>
</openerp>