元素 xpath 无法位于父视图中

我需要自定义从销售模块中打印的字段，因此我创建了一个新模块并安装了它。我已经创建了一个 XML 文件，但出现以下错误：

odoo.tools.convert.ParseError: "Error while validating constraint

Element '<xpath expr="//table[@class='table table-condensed']//thead//tr">' cannot be located in parent view

Error context:
View `report_quotation_inherit_demo`
[view_id: 1603, xml_id: n/a, model: n/a, parent_id: 649]
None" while parsing None:5, near
<data inherit_id="sale.report_saleorder_document">
        <!-- Finds the first table with as class table table-condensed and gives the ability to modify it
         This will replace everything withing tr (including tr)-->
        <xpath expr="//table[@class='table table-condensed']//thead//tr" position="replace">
                    <tr style="background-color:lightgray;">
                        <th>Description</th>
                        <th class="text-right">Price</th>
                    </tr>
        </xpath>
        <!-- This will search for the 4'th td element (in the tbody with class sale_tbody) and will remove it. -->
        <!-- Important: if you would start with element 2, then do 3 and then do 4 you will see strange behaviour.
            The first statement would remove element 2 making all other elements move in numbering too. -->
        <xpath expr="//tbody[@class='sale_tbody']//tr//td[4]" position="replace">
        </xpath>
        <xpath expr="//tbody[@class='sale_tbody']//tr//td[3]" position="replace">
        </xpath>
        <xpath expr="//tbody[@class='sale_tbody']//tr//td[2]" position="replace">
        </xpath>
        </data>

您还没有提供完整的视图定义，所以我不能确定这是问题所在，但似乎您只需要更改使用您的xpath表达式。

使用时xpath, your expr应该开始于//（这是简写/sheet/）。任何附加元素应由单个分隔/.

# Instead of
# <xpath expr="//table[@class='table table-condensed']//thead//tr">
# Try using
 <xpath expr="//table[@class='table table-condensed']/thead/tr">

您将需要更新您的所有xpath使用的表达式//元素之间。

You can 请参阅此文档 https://odoo-development.readthedocs.io/en/latest/dev/xml/xpath.html一个基本的例子。

可以找到一些更高级的示例.