openerp v7 - edit 'delivery slip' pdf template to include 'Customer Reference'

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Project Budget (USD)
$30 - $250

Project Description:
We are typing our websales orders into OpenErp and use the Customer Reference field of the OpenErp sales order to record the websales order number.
We need this order number on the print out pdf : Warehouse->Delivery Orders->Delivery Slip.....
I Guess this is a simple XML edit for someone who knows the OpenErp software, File structure and Objects.

* Please dont quote unless you are an experience OpenErp dev with Freelancer rating *

Skills required:
Python, XML
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