[ADD] accounting: From Vendor Bills to Payments

https://docs.google.com/document/u/1/d/1cguFjjT_KopHzx6LSU8tLW1Ttq6qUPzahhz2Moyrbzk/edit?usp=sharing

accounting/overview/process_overview/supplier_bill.rst

@@ -1,9 +1,144 @@
-==============================
-From Billing to payment orders
-==============================
+==================================
+From Vendor Bills to Payments
+==================================
 
-Creating Bills
-==============
+Once vendor bills are registered in Odoo, you can easily pay vendors for
+the correct amount and at the right time (not too late, not too early;
+depending on your vendor policy). Odoo also offers reports to track your
+aged payable balances.
 
-You can create multiple Supplier Bills and instead of paying one by
-one with direct payment button, you can pay later.
+If you want to control vendor bills received from your vendors, you can
+use the Odoo Purchase application that allows you to control and
+pre-complete them automatically based on past purchase orders.
+
+From Vendor Bill to Payment
+===========================
+
+Record a new vendor bill
+------------------------
+
+When a vendor bill is received, you can record it from :menuselection:`Purchases --> Vendor Bills` 
+in the Accounting application. As a shortcut,
+you can also use the **New Bill** feature on the accounting dashboard.
+
+.. image:: ./media/vendor_bill01.png
+   :align: center
+
+To register a new vendor bill, start by selecting a vendor and inputting
+their invoice as the **Vendor Reference**, then add and confirm the product
+lines, making sure to have the right product quantities, taxes and
+prices.
+
+.. image:: ./media/vendor_bill02.png
+   :align: center
+
+Save the invoice to update the pre tax and tax amounts at the bottom of
+the screen. You will most likely need to configure the prices of your
+products without taxes as Odoo will compute the tax for you.
+
+.. note:: 
+    On the bottom left corner, Odoo shows a summary table of all taxes on the vendor bill. 
+    In several countries, different methods are accepted to round the totals (round per line, 
+    or round globally). The default rounding method in Odoo is to round the final prices 
+    per line (as you may have different taxes per product. E.g. Alcohol and cigarettes). 
+    However if your vendor has a different tax amount on their bill, you can change the 
+    amount in the bottom left table to adjust and match.
+
+Validate The Vendor Bill
+------------------------
+
+Once the vendor bill is validated, a journal entry will be generated
+based on the configuration on the invoice. This journal entry may differ
+depending on the the accounting package you choose to use.
+
+For most European countries, the journal entry will use the following
+accounts:
+
+-  **Accounts Payable:** defined on the vendor form
+
+-  **Taxes:** defined on the products and per line
+
+-  **Expenses:** defined on the line item product used
+
+For Anglo-Saxon (US) accounting, the journal entry will use the
+following accounts:
+
+-  **Accounts Payable:** defined on the vendor form
+
+-  **Taxes:** defined on the products and per line
+
+-  **Goods Received:** defined on the product form
+
+You can check your Profit & Loss or the Balance Sheet reports after
+having validated a couple of vendor bills to see the impact on your
+general ledger.
+
+Pay a bill
+----------
+
+To create a payment for an open vendor bill directly, you can click on **Register a
+Payment** at the top of the form.
+
+From there, you select the payment method (i.e. Checking account, credit
+card, check, etc…) and the amount you wish to pay. By default, Odoo will
+propose the entire remaining balance on the bill for payment. In the
+memo field, we recommend you set the vendor invoice number as a
+reference (Odoo will auto fill this field from the from the vendor bill
+if set it correctly).
+
+.. image:: ./media/vendor_bill03.png
+   :align: center
+
+
+.. note::
+    You can also register a payment to a vendor directly without applying it to a vendor bill. 
+    To do that, :menuselection:`Purchases --> Payments`. Then, 
+    from the vendor bill you will be able to reconcile this payment with directly.
+
+Printing vendor Checks
+----------------------
+
+If you choose to pay your vendor bills by check, Odoo offers a method to
+do so directly from your vendor payments within Odoo. Whether you do so
+on a daily basis or prefer to do so at the end of the week, you can
+print in checks in batches.
+
+If you have checks to print, Odoo’s accounting dashboard acts as a to do
+list and reminds you of how many checks you have left to be printed.
+
+.. image:: ./media/vendor_bill04.png
+   :align: center
+
+By selecting the amount of checks to be printed, you can dive right into
+a list of all payments that are ready to be processed.
+
+Select all the checks you wish to print (use the first checkbox to
+select them all) and set the action to **Print Checks**. Odoo will ask you
+to set the next check number in the sequence and will then print all the
+checks at once.
+
+.. image:: ./media/vendor_bill05.png
+   :align: center
+
+Reporting
+=========
+
+Aged payable balance
+--------------------
+
+In order to get a list of open vendor bills and their related due dates,
+you can use the **Aged Payable** report, under the reporting menu, (in
+:menuselection:`Reporting --> Business Statement --> Aged payable`) to get a visual of all of
+your outstanding bills.
+
+.. image:: ./media/vendor_bill06.png
+   :align: center
+
+From here, you can click directly on a vendors name to open up the
+details of all outstanding bills and the amounts due, or you can
+annotate any line for managements information. At any point in time
+while you’re looking through the report, you can print directly to Excel
+or PDF and get exactly what you see on the screen.
+
+.. seealso::
+    * :doc:`customer_invoice`