<data priority="50">
    <xpath expr="//table[@name='invoice_line_table']//td[@name='account_invoice_line_name']/span[1]" position="after">
        <t t-set="lot_ids" t-value="o.picking_ids.move_line_ids.lot_id.filtered(lambda l: l.product_id == line.product_id)"/>
        <t t-if="lot_ids">
            <br/>
            <span>Seriennummern:</span>
            <t t-esc="', '.join(lot_ids.mapped('name'))"/>
            <!-- <ul class="list-unstyled">
        <t t-foreach="lot_ids" t-as="lot">
          <li t-esc="lot.name" />
        </t>
      </ul> -->
        </t>
    </xpath>
</data>
