sale_stock_availability/security/sale_order.xml

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

        <record model="ir.module.category" id="module_category_sales_stock">
            <field name="name">Sales Stock Availability</field>
            <field name="description">Helps you see stock on quotations.</field>
            <field name="sequence">2</field>
        </record>

        <!-- add applications to base groups -->
        <record model="res.groups" id="see_stock_boolean">
            <field name="category_id" ref="module_category_sales_stock"/>
            <field name="name">Only yes/no</field>
        </record>

        <record model="res.groups" id="see_stock_value">
            <field name="category_id" ref="module_category_sales_stock"/>
            <field name="name">Stock Value</field>
            <!-- No lo podemos agregar porque si es asi va a mostrar los dos campos -->
            <!-- <field name="implied_ids" eval="[(4, ref('see_stock_boolean'))]"/> -->
        </record>

    </data>
</openerp>