I’ve created an addon that inherits from mrp.bom and added a barcode field which relates to product_tmpl.barcode and it displays numbers. I can add that field just fine to the tree and form views for mrp.bom, but when it comes to displaying it in the mrp.report_mrp_bom or report_mrp_bom_pdf_line view, I fail. I can add in the column name, just not the values for each component line in the BoM.
I’ve noticed a .py file in mrp/report/ named something like mrp_report_bom_structure.py that has a class with loads of different methods inside to get things like pdf line data, bom data, component data, etc. Do I need to somehow inherit from that class and methods? I’ve not found any documentation for Odoo on inheriting methods.
If anyone is familiar with any of this, all I need is to be able to add a single field into the report that shows the barcode number for the BoM itself and all of its components and sub-components.

~Model~

class BoMs(models.Model):
    _inherit = "mrp.bom"

    barcode = fields.Char(
        related="product_tmpl_id.barcode", string="Barcode", store=True
    )


~View~

<odoo>
  <data>

    <!-- BoM Overview Report -->
    <template id="report_mrp_bom_inherit" inherit_id="mrp.report_mrp_bom">
      <!-- Adding Barcode to the header -->
      <xpath expr="//table/thead/tr/th[1]" position="after">
        <th>Barcode</th>
      </xpath>
    </template>

    <!-- BoM lines -->
    <template id="report_mrp_bom_pdf_line_inherit" inherit_id="mrp.report_mrp_bom_pdf_line">
      <xpath expr="//tr/td[1]" position="after">
        <td t-esc="l['barcode'] or ''"/>
      </xpath>
    </template>

  </data>
</odoo>