title: odoo - add tablerow in sales order total costs
body: <p>I am trying to add an extra row in the sales order between the <em>total untaxed cost</em> and the <em>total taxes cost</em>. When looking at the the <code>report_saleorder.xml</code> my line should be added inside the following code:</p>
  
  <pre><code>&lt;div class="row"&gt;
                  &lt;div class="col-xs-4 pull-right"&gt;
                      &lt;table class="table table-condensed"&gt;
                          &lt;tr class="border-black"&gt;
                              &lt;td&gt;&lt;strong&gt;Total Without Taxes&lt;/strong&gt;&lt;/td&gt;
                              &lt;td class="text-right"&gt;
                                  &lt;span t-field="o.amount_untaxed"
                                      t-field-options='{"widget": "monetary", "display_currency": "o.pricelist_id.currency_id"}'/&gt;
                              &lt;/td&gt;
                          &lt;/tr&gt;
                          &lt;tr&gt;
                              &lt;td&gt;Taxes&lt;/td&gt;
                              &lt;td class="text-right"&gt;
                                  &lt;span t-field="o.amount_tax"
                                      t-field-options='{"widget": "monetary", "display_currency": "o.pricelist_id.currency_id"}'/&gt;
                              &lt;/td&gt;
                          &lt;/tr&gt;
                          &lt;tr class="border-black"&gt;
                              &lt;td&gt;&lt;strong&gt;Total&lt;/strong&gt;&lt;/td&gt;
                              &lt;td class="text-right"&gt;
                                  &lt;span t-field="o.amount_total"
                                      t-field-options='{"widget": "monetary", "display_currency": "o.pricelist_id.currency_id"}'/&gt;
                              &lt;/td&gt;
                          &lt;/tr&gt;
                      &lt;/table&gt;
                  &lt;/div&gt;
              &lt;/div&gt;
  </code></pre>
  
  <p>Since editing the core xml is not an option I was wondering if it would be possible to do this using <code>&lt;xpath&gt;</code> but I am unsure how to go about doing this. I already have created a <code>field</code> in my sale.py file and looking at their code my xml should be something like</p>
  
  <pre><code>&lt;tr&gt;
       &lt;td&gt;Insurance&lt;/td&gt;
       &lt;td class="text-right"&gt;
           &lt;span t-field="o.amount_insurance" t-field-options='{"widget": "monetary", "display_currency": "o.pricelist_id.currency_id"}'/&gt;
       &lt;/td&gt;
  &lt;/tr&gt;
  </code></pre>
  
  <p>Any help on how I would be able to do this would be very appreciated</p>