Greetings!!!

We will talking about the Purchase to Sale flow on ERP with using OpenERP.

Before going to start We assume that you know about the basic configuration of product like procurement method, supply method etc...

Here we are going to talk about the Purchase to Sale flow, So our procurement method should be "Make to Stock. Cause we have to take care about our stock.

Let's take one real-life example and we will implement this example same with OpenERP.

Example: Nortan Store is one general store which purchased the pen in number of dozen (12 PCS) and selling this pen one by one on retail, also maintain their stock on dozen as well as minimum two dozen product must be available on Nortan's warehouse.

We have to implement this scenario by using OpenERP.

Before going to start please create your database with demo data.
Install purchase and sale module.

Now first of all we have to create as a pen product.

Open the Sale/Products/Products view. Create a new product with name 'pen' as we discussed select the procurement method is "make to stock".

Select the default uom and purchase uom as a 'dozen' and assign the UOS(unit of sale) as a PCS(Unit).
Create Purchase order of pen for 1 dozen. Now confirm your purchase order. It will create the draft invoice and reception of pen.
We have to receive our product, So go to Warehouse/Incoming Shipment search your picking (by product or you can check the History tab on Purchase order). Open the reception process it.

Now check the stock of pen, Go to product view and see you have 1 dozen product. Now we are going to sell this on PCS.

Create a Sale order of pen with 10 PCS,Confirm the Sale order. It will create the Delivery Order. Go to Warehouse/Delivery Order select your Delivery Order. Check the availability of your product you can see your move will available then process the Delivery Order.

Now check your stock you can see the 2PCS on your stock.

OpenERP provide the one useful functionality of minimum order rule. You can set your "Minimum Stock Rule" for it, It will automatically manage your warehouse's stock.

Open the product form view and see the right side panel and select the "Minimum stock rule" link. Select the warehouse and location, assign the minimum quantity ='1.0' dozen (means when your product's stock goes below of this quantity it will automatic create the related order for remaining quantity which will exceed your maximum quantity) assign maximum quantity = 2 dozen.

Now for minimum order rule we have to run the scheduler.Go to Warehouse/scheduler/Compute Scheduler and run the scheduler. It will create a Purchase order for pen with 2 dozen. Now you can done your reception and you will 2 dozen product on your warehouse.

Hope this will help for you and thanks for the reading.

You will see the video for 6.1 and trunk(V7) on youtube for the same soon.