My Goal is to print fields of the "sale.order" into the invoice pdf.
Normaly I use
<span t-field="o.partner_id"/>
(invoice_line for example).
and nest it like this for example:
<span t-field="o.partner_id.phone"/>
That mostly work for account.invoice and all kinds of connected fields.
Is there a way to "nest to" the informations of the sale.order which Im missing? Or is there maybe a way not to start from "o"?