cooperative-market/beesdoo_purchase/report/report_purchaseorder.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
<data>
    <template id="report_purchaseorder_document" inherit_id="purchase.report_purchaseorder_document" name="beesdoo purchaseorder">
        <div t-if="o.date_order" position="after">

            <div t-if="o.create_uid.name" class="col-xs-3">
                <strong>Your Referent:</strong>
                <div t-field="o.create_uid"
                t-options='{"widget": "contact", "fields": ["name", "phone", "mobile"], "no_marker": true, "phone_icons": true}'/>
            </div>

        </div>
    </template>
</data>
</odoo>