[IMP] accounting: Odoo 13 updates

- Credit Notes and Refunds (credit_notes)
- Batch Payments: SEPA Direct Debit (SDD) (batch_sdd)
These were also renamed.

accounting/receivables/customer_invoices/credit_notes.rst

@@ -0,0 +1,96 @@
+========================
+Credit Notes and Refunds
+========================
+A **credit note**, or **credit memo**, is a document issued 
+to a customer that notifies them that they have been credited 
+a certain amount.
+
+There are several reasons that can lead to a credit note, such as:
+   * a mistake in the invoice
+   * a return of the goods, or a rejection of the services
+   * the goods delivered are damaged
+
+.. note::
+   Issuing a credit note is the only legal way to cancel, 
+   refund or modify a validated invoice. Don’t forget to 
+   *register the payment* afterward if you need to send money
+   back to your customer.
+
+Issue a Credit Note
+===================
+You can create a credit note from scratch by going to 
+:menuselection:`Accounting --> Customers --> Credit Notes`, 
+and by clicking on *Create*. Filling the Credit Note’s form 
+works the same way as the Invoice’s form.
+
+However, most of the time, credit notes are generated directly 
+from the invoices they are related to.
+
+To do so, open the *Customer Invoice*, and click on *Add Credit Note*.
+
+.. image:: media/credit_notes01.png
+   :align: center
+
+You can choose between three options:
+   - Partial Refund
+   - Full Refund
+   - Full refund and new draft invoice
+
+.. note::
+   Credit Notes’ numbers start with “R” and are followed by the 
+   number of the document they are related to (e.g., RINV/2019/0004). 
+
+Partial Refund
+--------------
+Odoo creates a draft credit note already prefilled with all the 
+necessary information from the original invoice.
+
+This is the option to choose to do a partial refund, or if you 
+want to modify any detail on the credit note.
+
+.. note::
+   This is the only option available for invoices that are already marked as *Paid*.
+
+Full Refund
+-----------
+Odoo creates a credit note, automatically validates it, and 
+reconciles the original invoice with it.
+
+.. image:: media/credit_notes02.png
+   :align: center
+
+This is the option to choose to do a full refund or cancel 
+a validated invoice.
+
+Full refund and new draft invoice
+---------------------------------
+Odoo creates a credit note, automatically validates it, reconciles 
+the original invoice with it, and open a new draft invoice 
+prefilled with the same details from the original invoice.
+
+This is the option to choose to modify the content of a validated invoice.
+
+Record a Vendor Refund
+======================
+**Vendor Refunds** are recorded the same way you would do with invoices’ credit notes:
+
+You can either create a credit note from scratch by going 
+to :menuselection:`Accounting --> Vendors --> Refund`, and 
+by clicking on *Create*, or by opening the validated *Vendor Bill*, 
+and clicking on *Add Credit Note*.
+ 
+Journal Entries
+===============
+Issuing a credit note from an invoice creates a **reverse entry** 
+that zeroes out the journal items generated by the original invoice. 
+
+Here is an example of an invoice’s journal entry:
+
+.. image:: media/credit_notes03.png
+   :align: center
+
+And here is the credit note’s journal entry generated to reverse 
+the original invoice above:
+
+.. image:: media/credit_notes04.png
+   :align: center