[ADD] accounting/l10n_be: documentation for new codaclean module

In enterprise PR odoo/enterprise/pull/93909 we add a new module
to automatically import bank statements from Codaclean.
Codaclean is an external provider that allows its users to access
their bank statements in form of CODA files.

This PR adds the information on how to configure / use the new module.

task-4844423

Author: svfu-odoo

content/applications/finance/fiscal_localizations/belgium.rst

@@ -428,6 +428,72 @@ Potential issues
     :guilabel:`CodaBox` section, click on :guilabel:`Manage Connection`, then click on
     :guilabel:`Revoke`.
 
+.. _belgium/codaclean:
+
+Codaclean
+---------
+
+**Codaclean** is a service that allows Belgian companies and accounting firms to access bank
+information and statements. Odoo provides a way to import such statements automatically.
+
+.. _belgium/codaclean-configuration:
+
+Configuration
+~~~~~~~~~~~~~
+
+To configure and use **Codaclean**, first :ref:`install <general/install>` the
+:guilabel:`Codaclean (l10n_be_codaclean)` module.
+
+
+.. _belgium/codaclean-configuration-connection:
+
+Configure the connection
+************************
+
+#. Open the Settings app to make sure your company's :guilabel:`Country` is
+   set to :guilabel:`Belgium` in the :ref:`Companies <general/companies/company>` section.
+#. Go to :menuselection:`Accounting --> Configuration --> Settings` and scroll to the
+   :guilabel:`Codaclean` section.
+#. Click on :guilabel:`Manage Connection` to open the connection wizard, enter your
+   Codaclean :guilabel:`Username` and :guilabel:`Password` and click :guilabel:`Connect`.
+
+The :guilabel:`Status` should have now switched to :guilabel:`Connected`.
+
+If the connection is established the :guilabel:`Manage Connection` wizard can be used
+to update your Codaclean credentials (i.e. in case you change your password on Codaclean)
+or remove the connection.
+
+- To update your Codaclean credentials enter the new :guilabel:`Username` and
+  new :guilabel:`Password` and click on :guilabel:`Change Credentials`.
+- To remove the Codaclean connection just click on :guilabel:`Disconnect`.
+  A :guilabel:`Username` or :guilabel:`Password` is not needed.
+
+.. _belgium/codaclean-configuration-journal:
+
+Configure the journals
+**********************
+
+#. :doc:`Create a new bank journal <../accounting/bank>`.
+#. Set the right IBAN in the :guilabel:`Account Number` field.
+#. Select :guilabel:`Codaclean Synchronization` as the :guilabel:`Bank Feed`.
+
+.. tip::
+   When working with bank transactions that use different currencies, it is recommended to
+   create multiple journals with the same bank account but different currencies.
+
+
+.. _belgium/codaclean-synchronization:
+
+Synchronization
+~~~~~~~~~~~~~~~
+
+Once the connection is established, Odoo can be synchronized with Codaclean.
+
+CODA files are automatically imported from Codaclean every 12 hours. You do
+not have to do anything. However, if you wish, it can also be done manually,
+by clicking on :guilabel:`Fetch from Codaclean` in the Accounting Dashboard.
+
+
 Electronic invoicing
 ====================