How can I filter the list of customers to show customers who do not have a confirmed sales order in the last 30 days? I was trying to use a filter domain but I don't know how to include the related field of sale.order, I can only filter on fields within res.partner.
It would especially nice if I could color code the customer list by date of their last order, example: customers whose last order is older than 30days=yellow / 60days=orange / 90days = red. Can anyone point me in the right direction how to do this? Thank you.
Odoo 10 CE