flectra/addons/stock/report/report_location_barcode.xml

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

<template id="assets_common" name="stock_location_barcodes pdf assets" inherit_id="web.report_assets_common">
    <xpath expr="." position="inside">
        <link href="/stock/static/src/less/report_location_barcode.less" rel="stylesheet"/>
    </xpath>
</template>

<template id="report_location_barcode">
    <t t-call="web.basic_layout">
        <div t-foreach="[docs[x:x+4] for x in xrange(0, len(docs), 4)]" t-as="page_docs" class="page page_stock_location_barcodes">
            <t t-foreach="page_docs" t-as="o">
                <t t-if="o.barcode"><t t-set="content" t-value="o.barcode"/></t>
                <t t-if="not o.barcode"><t t-set="content" t-value="o.name"/></t>
                <img class="barcode" t-att-src="'/report/barcode/?type=%s&amp;value=%s&amp;width=%s&amp;height=%s&amp;humanreadable=1' % ('Code128', content, 600, 100)"/>
            </t>
        </div>
    </t>
</template>
</data>
</flectra>