Thanks Mitul, but unfortunately it's not working. Here is corrects answer, which i get on stackexchange forum:

>>>

You are trying to change o.name that refers to the name of the invoice record with o.product_idthat it's not a field of the account.invoice model, it's a field of the account.invoice.line model that it's backed by the field invoice_line_ids on the account.invoice model.

You will need to use it for example to change the line:

<td><span t-field="l.name"/></td>

With:

<td><span t-field="l.product_id.name"/></td>

>>>

Hello,

 try with below code

 <div class="row mt32 mb32">
     <div class="col-xs-2" t-if="o.name">
          <strong>Description:</strong>
          <p t-field="o.product_id.your_field_name"/>
     </div>
</div>