[ADD] How to work with serial numbers?

https://docs.google.com/document/d/1RO4DHPPKCoo1kIzmDPxcoOfS2_Rf_s1sRv3nRnX2vnA/edit#

inventory/lots_serial_numbers/serial_numbers.rst

@@ -1,3 +1,126 @@
 ================================
 How to work with serial numbers?
-================================
+================================
+
+Introduction
+============
+
+Serial Number Tracking is used to track products with serial numbers on
+every transactions. You can track the current location of the product
+with serial numbers. When the products are moved from one location to
+another location, the system will automatically identify the current
+location of the product based on last movement of the product. So you
+can get the last location where the products are moved.
+
+The double-entry management in Odoo enables you to run very advanced
+traceability.
+
+Setting up
+==========
+
+Application configuration
+-------------------------
+
+You need activate the tracking of serial numbers in the settings. In the
+**Inventory** application, go to :menuselection:`Configuration --> Settings`, 
+select **Track lots or serial numbers**.
+
+.. image:: media/serial_numbers01.png
+   :align: center
+
+Then click on **Apply**.
+
+Product Configuration
+---------------------
+
+Finally, you have to configure which products you want to track in lots.
+
+Go into :menuselection:`Inventory Control --> Products`, and open the product 
+of your choice. Click on **Edit**, and in the **Inventory** tab, select **By Unique
+Serial Number**, then click on **Save**.
+
+.. image:: media/serial_numbers02.png
+   :align: center
+
+Manage Serial Numbers
+=====================
+
+Transfers
+---------
+
+In order to process a transfer of a product tracked by serial number,
+you have to input the number(s).
+
+Click on the serial number icon :
+
+.. image:: media/serial_numbers03.png
+   :align: center
+
+A window will pop-up. Click on **Add an item** and fill in the serial
+numbers.
+
+.. image:: media/serial_numbers04.png
+   :align: center
+
+If you move products that already have serial numbers assigned, those
+will appear in the list. Just click on the **+** icon to to confirm that you
+are moving those serial numbers.
+
+.. image:: media/serial_numbers05.png
+   :align: center
+
+.. note::
+    In the scanner interface, you just have to scan the serial numbers.
+
+Inventory adjustment
+--------------------
+
+Inventory of a product tracked by serial numbers can be done in 2 ways:
+
+-  Classic inventory by products
+
+-  Inventory of a serial number
+
+When doing a classic inventory, there is a **Serial Number** column. If the
+product has already been assigned with a number, it is already
+pre-filled.
+
+Click on **Add an item** if the product has not been inventoried yet. You
+can easily create serial numbers, just type in a new number in the
+column.
+
+.. image:: media/serial_numbers06.png
+   :align: center
+
+The quantity should be 1 for each line.
+
+You can also just do the inventory of a serial number. In this case, you
+will have to fill in the serial number. You can also create a new one
+from here. Just type in the number, a window will pop out to link it to
+a product.
+
+.. image:: media/serial_numbers07.png
+   :align: center
+
+Serial Number traceability
+==========================
+
+The serial number given to these items allow you to keep track of where
+they were received, put in stock, to whom they were sold and where they
+were shipped to.
+
+To track an item, open the **Inventory** module, and in :menuselection:`Inventory
+Control --> Serial Numbers/lots`, click on the serial number corresponding
+to your search.
+
+.. image:: media/serial_numbers08.png
+   :align: center
+
+You can have more details by clicking on the **Traceability** button :
+
+.. image:: media/serial_numbers09.png
+   :align: center
+
+.. seealso::
+    * :doc:`differences`
+    * :doc:`lots`