[ADD] inventory: How to do inter-warehouses transfers?

https://docs.google.com/document/d/1GnAFDiHjlRcFdE78NGqR31EjFrS8Kvj8-r0uEDRIgDU/edit#

inventory/routes/concepts/inter_warehouse.rst

@@ -1,3 +1,134 @@
 =====================================
 How to do inter-warehouses transfers?
-=====================================
+=====================================
+
+If you own different warehouses you might want to transfer goods from
+one warehouse to the other. This is very easy thanks to the inventory
+application in Odoo.
+
+Configuration
+=============
+
+First of all you have to select the multi locations option. Go to
+:menuselection:`Configuration --> Settings` in the **Inventory application**.
+Then tick the **Manage several locations per
+warehouse** option. Please don't forget to **apply** your changes.
+
+.. image:: media/inter01.png
+   :align: center
+
+.. tip::
+
+	This option should also be ticked if you wish to manage different
+	locations and routes in your warehouse.
+
+Creating a new warehouse
+========================
+
+The next step is to create your new warehouse. In the Inventory application
+click on :menuselection:`Configuration --> Warehouse Management --> 
+Warehouses`. You are now able to create your warehouse by clicking on
+**Create**.
+
+Fill in a **Warehouse Name** and a **Short Name**. The short name is 5
+characters maximum.
+
+.. image:: media/inter02.png
+   :align: center
+
+.. tip::
+
+	please note that the **Short Name** is very important as it will
+	appear on your transfer orders and other warehouse documents. It might
+	be smart to use an understandable one (e.g.: WH/[first letters of
+	location]).
+
+If you go back to your dashboard, new operations will automatically have
+been generated for your new warehouse.
+
+.. image:: media/inter03.png
+   :align: center
+
+Creating a new inventory
+========================
+
+If you create a new warehouse you might already have an existing
+physical inventory in it. In that case you should create an inventory in
+Odoo, if not you can skip this step.
+
+Go into the inventory application, select :menuselection:`Inventory Control -->
+Inventory Adjustment`. You can then create a new inventory by clicking on
+**Create**. Fill in the **Inventory Reference**, **Date**
+and be sure to select the right warehouse and location.
+
+.. image:: media/inter04.png
+   :align: center
+
+Next, click on **Start Inventory**. A new window will open where you will
+be able to input your existing products. Select add an item and indicate
+the **Real Quantity** available in the warehouse. The theoretical quantity
+can not be changed as it represents a computed quantity from purchase
+and sales orders.
+
+.. image:: media/inter05.png
+   :align: center
+
+Don't forget to validate your inventory once you have recorder the state of
+all yours product.
+
+Create an internal transfer
+===========================
+
+The final step is to create your internal transfer. If you want to
+tranfer 2 units of a product from your first warehouse to another one in
+Brussels, proceed as follows:
+
+From your dashboard, select a internal movement of one of the two
+warehouses. To do so, click on :menuselection:`More  --> Transfer`.
+
+.. image:: media/inter06.png
+   :align: center
+
+A new window will open where you will be able to select the source
+location zone (in this case our "old warehouse") and the destination
+location zone (in this case our "new" warehouse located in Brussels).
+
+Add the products you want to transfer by clicking on **Add an Item** and
+don't forget to **Validate** or **Mark as TODO** once you are done.
+
+.. image:: media/inter07.png
+   :align: center
+
+If you select **Validate**, Odoo will process all quantities to transfer.
+
+If you select **Mark as TODO**, Odoo will put the transfer in **Waiting
+Availability** status. Click on **Reserve** to reserve the amount of
+products in your source warehouse.
+
+It is also possible to manually transfer each product:
+
+1. Via your dashboard, select the transfer order in the source location.
+
+   .. image:: media/inter08.png
+	  :align: center
+
+2. Select the right transfer order
+
+   .. image:: media/inter09.png
+      :align: center
+
+3. Click on the little pencil logo in the lower right
+corner in order to open the operation details window. In this new
+window you can manually indicate how much products you process
+
+.. image:: media/inter10.png
+   :align: center
+
+.. tip::
+
+	If you decide to partially process the transfer order (e.g. a part of the
+	products can't be shipped yet due to an unexpected event), Odoo will
+	automatically ask if you wish to create a **backorder**.
+	Create a backorder if you expect to process the remaining products
+	later, do not create a backorder if you will not supply/receive the
+	remaining products.