Firstly Read the Description Of that module Sale Quotation Sourcing Description This module implements manual sourcing of sale order lines from purchase order lines. Instead of having the confirmation of a SO generate procurements which in turn may generate a PO, we invert the process: in order to generate a quote for a customer, we ask quotes to different suppliers. Once the sale quotation is accepted by the customer and the user confirms it, a wizard is presented to choose which PO to use to source the SO lines. The process should mimic closely the way that Odoo handles a MTO, buy order. The only difference is that the PO is chosen manually and not automatically generated. The end result should be the same. To show that, two test cases are provided that show the standard process and the manually sourced one. The drop shipping case is handled as well, with a warning to check if the destination locations of the procurement and the sourced PO are consistent. In addition to that, when the user sources a sale line with a purchase line, the system tries to choose automatically an appropriate route (MTO or drophipping). This on_change method is the only place where the module stock_dropshipping is used, otherwise it contains little more than preconfigured Routes, Rules, and Picking Types. All other code and the tests do not use it. That dependency can be easily removed later if it is needed to manually configure dropshipping and MTO routes. Note: the package nose is required to run the tests. It is not noted in the external dependencies since it is not required in production.