[ADD] How to determine if a vendor bill should be paid (3-way matching)

purchase/purchases/rfq.rst

@@ -11,3 +11,4 @@ Request for Quotations
    rfq/cancel
    rfq/approvals
    rfq/analyze
+   rfq/3_way_matching

purchase/purchases/rfq/3_way_matching.rst

@@ -0,0 +1,67 @@
+=================================================================
+How to determine if a vendor bill should be paid (3-way matching)
+=================================================================
+
+In some industries, you may receive a bill from a vendor before
+receiving the ordered products. However, the bill should maybe not be
+paid until the products have actually been received.
+
+To define whether the vendor bill should be paid or not, you can use
+what is called the **3-way matching**. It refers to the comparison of
+the information appearing on the Purchase Order, the Vendor Bill and the
+Receipt.
+
+The 3-way matching helps you to avoid paying incorrect or fraudulent
+vendor bills.
+
+Configuration
+-------------
+
+Go in :menuselection:`Purchase --> Configuration --> Settings`
+and activate the 3-way matching.
+
+.. image:: media/3_way_matching01.png
+   :align: center
+   :width: 6.50000in
+   :height: 0.70833in
+
+
+Should I pay this vendor bill?
+------------------------------
+
+Once this setting has been activated, a new information appears on the
+vendor bill, defining whether the bill should be paid or not. There are
+three possible values:
+
+*Use case 1*: I have received the ordered products.
+
+.. image:: media/3_way_matching02.png
+   :align: center
+   :width: 2.26042in
+   :height: 0.28125in
+
+*Use case 2*: I have not received the ordered products.
+
+.. image:: media/3_way_matching03.png
+   :align: center
+   :width: 2.03125in
+   :height: 0.26042in
+
+*Use case 3*: the quantities do not match across the Purchase Order,
+Vendor Bill and Receipt.
+
+.. image:: media/3_way_matching04.png
+   :align: center
+   :width: 1.92708in
+   :height: 0.34375in
+
+.. tip::
+   The status is defined automatically by Odoo. However, if you want
+   to define this status manually, you can tick the box *Force Status* and
+   then you will be able to set manually whether the vendor bill should be
+   paid or not.
+
+.. image:: media/3_way_matching05.png
+   :align: center
+   :width: 1.92708in
+   :height: 0.34375in