odoo/addons/product/security/product_security.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
<data noupdate="1">

    <record id="group_uos" context="{'noadmin':True}" model="res.groups">
        <field name="name">Useability / Product UoS View</field>
    </record>
    <record id="group_product_manager" model="res.groups">
        <field name="name">Product / Manager</field>

    </record>

     <record model="ir.rule.group" id="product_comp_rule_group">
        <field name="name" >Product multi-company</field>
        <field name="model_id" ref="model_product_template"/>
        <field name="global" eval="True"/>
    </record>
    <record id="product_comp_rule" model="ir.rule">
        <field name="rule_group" ref="product_comp_rule_group"/>
        <field name="domain_force">['|',('company_id','=',False),('company_id','child_of',[user.company_id.id])]</field>
    </record>

    <record id="group_product_variant" model="res.groups" context="{'noadmin':True}">
        <field name="name">Product / Variant</field>
    </record>

</data>
</openerp>