I think that its wrong logic in "purchase.py". It calculate scheduled date in 
PO as follow:
Scheduled date (PO) = Scheduled date (Procurement) - Purchase Lead Time 
(Company Configuration) - Delivery Lead Time (Product Supplier)

But auto Procurement already take into account Delivery Lead Time (Product 
Supplier) and we have total (for Sales Order or Minimum Stock Rule):
Scheduled date (PO) = TODAY + Delivery Lead Time (Product Supplier) - Purchase 
Lead Time (Company Configuration) - Delivery Lead Time (Product Supplier) = 
TODAY  - Purchase Lead Time (Company Configuration)
!!! Past due!!!

And for manual Procurement:
Scheduled date (PO) = TODAY (default scheduled date in manual procurement) - 
Purchase Lead Time (Company Configuration)
 - Delivery Lead Time (Product Supplier) 
!!! Past due!!!

I think formula must be:
Scheduled date (PO) = Scheduled date (Procurement) + Purchase Lead Time 
(Company Configuration) + Delivery Lead Time (Product Supplier)

and no take into account Delivery Lead Time (Product Supplier) in auto
Procurement!

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Indian Team, which is subscribed to OpenERP Addons.
https://bugs.launchpad.net/bugs/909666

Title:
  Purchase Expected Date

Status in OpenERP Addons (modules):
  New

Bug description:
  When make manual Purchase and add Product to PO then expected date (for full 
PO) and scheduled date (for PO line) calculate correct: scheduled date = 
current date plus Delivery Lead Time (from Product); expected date = 
min(scheduled dates).
  But when make automate Purchase through Procurement (Sales Order) then in new 
PO scheduled dates (for PO lines) calculate wrong: scheduled date = current 
date plus 1 day. And auto Purchase from manual Procurement: scheduled date = 
current date minus 7 day (here like Delivery Lead Time = 7).
  Product - Stockable, MTO, Buy.

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