I have captured detailed dates for a typical manufacturing flow. If any experts can help to answer it may help to understand the flow well which will benefit new comers to openERP. Thank you in advance.

I have a product (Phone) with Bill of Materials.

This Product is Make to Order, Supply Method: Manufacturing I have captured the relevant Screens for Easy Reference.

Note: All Data are Dummy Data to verify the flow.

1. Product Phone has Manufacturing Lead time of 1 Day. http://i.imgur.com/sRbdB8W.png
2. Product Phone has Bill Of Material. One of the Component is LOGIC IC. http://i.imgur.com/IuLAzr0.png
3. This Logic IC has Manufacturing Lead time of 4 Days and Supplier Lead time of 60 Days. http://i.imgur.com/9oJ4g8r.png
4. I have confirmed sales order on 16.Apr.2013. But the System Indicates back dated Sales order by 1 day(15.Apr.2013). http://i.imgur.com/wZX5AlE.png How does OpenERP calculates this date?
5. Upon confirming Sales order and running Scheduler, System Generates RFQ for LOGIC IC. http://i.imgur.com/oUdhhVi.png The date shown here is 18.Apr.2013. How does OpenERP calculates this Date?
6. Warehouse incoming shipment for LOGIC IC too 18.Apr.2013 when supplier has a Lead time of 60 Days. http://i.imgur.com/aDRyhcW.png How does this date is calculated by OpenERP?
7. Delivery order for product Phone is Scheduled Date is on 22nd. http://i.imgur.com/Drq8gCN.png How does OpenERP Calculates this Date?

I hope some one familiar with the Scheduler share their knowledge for the benefit of everyone.

Thank you.