rma/rma_sale/views/report_rma.xml

<?xml version="1.0" encoding="utf-8" ?>
<odoo>
    <template id="report_rma_document" inherit_id="rma.report_rma_document">
        <xpath expr="//div[@t-if='doc.picking_id']" position="before">
            <div t-if="doc.order_id" class="col-auto mw-100 mb-2">
                <strong>Sale order:</strong>
                <p class="m-0" t-field="doc.order_id" />
            </div>
        </xpath>
        <xpath expr="//div[@t-if='doc.user_id']" position="before">
            <div t-if="doc.operation_id" class="col-auto mw-100 mb-2">
                <strong>Requested operation:</strong>
                <p class="m-0" t-field="doc.operation_id" />
            </div>
        </xpath>
    </template>
</odoo>