manufacture/mrp_bom_version/security/mrp_bom_version_security.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data noupdate="1">
        <record id="group_mrp_bom_version" model="res.groups">
            <field name="name">MRP BoM version</field>
            <field name="category_id" ref="base.module_category_hidden" />
        </record>
    </data>
</openerp>