cooperative-market/beesdoo_purchase/security/invoice_security.xml

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

    <record id="group_invert_po_ref_on_inv_line" model="res.groups">
        <field name="name">Invert Purchase Order Reference on invoice line</field>
        <field name="category_id" ref="base.module_category_hidden"/>
    </record>

</odoo>