版本8.0， 想要发票修改报表页眉的内容，去公司设置下修改，返现无论如何也不生效。
放狗后得知：
You probably already know that you can customise the default Odoo header/footer by changing the Company settings. However when you create a PDF report such as a sale, quote or invoice you will find the header/footer remains unchanged.
The issue is that Quote/Sale orders do not use the Company-level report header/footer configuration.
To edit the header and footer for Quote/Sale orders you need to edit the QWeb view. Here is how to do this:
(1) Settings > Technical > User Interface > Views
(2) Search for “external”
(3) You will see report.external_layout, report.external_layout_header and report.external_layout_footer
(4) Edit these views as appropriate to modify the PDF version of the Quote/Sales orders
需要到 view视图中，搜索 ‘external’ 视图，然后修改 report.external_layout_header ，就可以修改 报表了。
思考： 报表中的 <t t-call="report.external_layout"> 就是放入表头，表尾巴， 通过添加不停的 layout, 可以使用不同的表头和表尾格式。
=============附加字体修改
解决方式如下：
1.增加字体：
sudo apt-get install ttf-wqy-zenhei
sudo apt-get install ttf-wqy-microhei
安装后可以在 /usr/share/fonts/truetype/wqy 看到新装的中文字体
2.在‘设置->公司->公司->编辑->报表的结构->字体‘里面，选择’搜索更多‘，然后选择
WenQuanYi Micro Hei 或者 WenQuanYi Zen Hei
保存即可。