I am using the point_of_sale app in Odoo v8.
In the report pos.order.report, the field product_qty has a type of integer, but I need it to be float, since many of my products are sold by Kg and have three decimal places.
I attempted to change the data type in the model definition, but it tells me I have to change it in Python code by a new module.
How do I go about this?