def METHOD_NAME(
    self, view_id=None, view_type="form", toolbar=False, submenu=False
):
    order_view = super().METHOD_NAME(view_id, view_type, toolbar, submenu)
    if view_type == "form":
        view = self.env["ir.ui.view"]
        sub_form_view = order_view["fields"]["order_line"]["views"]["form"]["arch"]
        sub_form_node = self.env["sale.order.line"].inject_fiscal_fields(
            sub_form_view
        )
        sub_arch, sub_fields = view.postprocess_and_fields(
            sub_form_node, "sale.order.line", False
        )
        order_view["fields"]["order_line"]["views"]["form"] = {
            "fields": sub_fields,
            "arch": sub_arch,
        }
    return order_view