Hello zhanghao章浩,

maybe it's a Bug / Features to show a limited message or due to some recent fixes.

you can show all messages via Edit Limit in Action of Message Menu.

Thanks & Regards,

Sunny Sheth (shethsunny555@gmail.com)

at runbot.odoo.com Odoo17 CE still have this problem  : 

But Odoo15-17 EE is ok,

odoo13 ce purchase order seem's ok:

but sales order have same problum:

A solution that comes to mind now is grouping. After grouping, the numbers are mostly correct, and the speed is also acceptable.  现在想到的一个方案是分组，分组后数字基本都是对的，速度上也可以接受