I should clarify that I am using a product which has Manufacture and Make to Order checked in the supply chain Routes.

My code works when I first install my module. I can write a note in my new field on the Sale order. Confirm the sale -> in Warehouse- Run Schedulers which creates the Manufacturing Order. My notes are visible on the Manufacturing Order under the Extra Information Tab under Priority as I expected.

BUT - After the server was powered down and restarted my note was still on the Sale Order form but had been removed from the Manufacturing form (the field label remained but the content had gone). I think it is because in the official sale_mrp.py _inherit=‘mrp.production’ takes precedence and it doesn't use my sale_lab.py _inherit=‘mrp.production’. Is there any way to overcome this?

UPDATE - To make sure my module is loaded last I added sale_mrp to the dependancies in __openerp.py it works a treat now!

On another issue – when adding examples of code to questions – how do I get them in a neat box as I've seen on other questions? (I'm new and have very low karma)