[ADD] inventory: new doc about inventory valuation and landed costs (#503)

inventory/management/reporting.rst

@@ -8,5 +8,6 @@ Valuation Methods
 
    reporting/inventory_valuation_config
    reporting/using_inventory_valuation
+   reporting/integrating_landed_costs
    reporting/valuation_methods_continental
    reporting/valuation_methods_anglo_saxon

inventory/management/reporting/integrating_landed_costs.rst

@@ -0,0 +1,65 @@
+=======================================================
+Integrating additional costs to products (landed costs)
+=======================================================
+
+The landed cost feature in Odoo allows to include additional costs
+(shipment, insurance, customs duties, etc.) into the cost of the
+product.
+
+.. note::
+         Landed costs can only be applied to products with a FIFO or AVCO costing
+         method and an automated inventory valuation (which requires the
+         accounting application to be installed).
+
+Configuration
+=============
+
+First, you need to go in *Inventory > Configuration > Settings* and
+activate the landed costs feature. You can also determine the default
+journal in which the landed cost accounting entries will be recorded.
+
+.. image:: media/integrating_landed_costs_01.png
+    :align: center
+
+Add costs to products
+=====================
+
+Receive the vendor bill
+-----------------------
+
+Let’s imagine I receive a bill from custom duties for a shipment. I’ll
+tick the box *Landed Costs* on the vendor bill line.
+
+.. image:: media/integrating_landed_costs_02.png
+    :align: center
+
+.. note::
+         The landed cost product must be of type service.
+
+If this product is always a landed cost, you can also define it on the
+product and avoid having to tick the box on each vendor bill.
+
+.. image:: media/integrating_landed_costs_03.png
+    :align: center
+
+At the top of my vendor bill, I’ll see a button *create landed costs*.
+I click on this button and a landed cost is automatically created. I can
+now decide on which picking those additional costs should apply.
+
+.. image:: media/integrating_landed_costs_04.png
+    :align: center
+
+I can now click on *Compute* and go in the tab *Valuation
+Adjustments* to see the impact on my products costs. The last step is
+to validate the landed cost.
+
+I can access the journal entry that has been created by the landed cost
+by clicking on the journal entry.
+
+.. image:: media/integrating_landed_costs_05.png
+    :align: center
+
+.. note::
+         You are not forced to start from the vendor bill, you can also go in
+         *Inventory > Operations > Landed Costs* and directly create the landed
+         cost from there.