Add support for ISO20022 "Category Purpose"

Add local instrument 'INST' for SEPA Instant Credit Transfer

account_banking_sepa_credit_transfer/models/__init__.py

@@ -2,3 +2,4 @@
 
 from . import account_payment_method
 from . import account_payment_order
+from . import account_payment_line

account_banking_sepa_credit_transfer/models/account_payment_line.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+# © 2017 Akretion - Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import models, fields
+
+
+class AccountPaymentLine(models.Model):
+    _inherit = 'account.payment.line'
+
+    # local_instrument 'INST' used for instant credit transfers
+    # which will begin on November 21st 2017, cf
+    # https://www.europeanpaymentscouncil.eu/document-library/
+    # rulebooks/2017-sepa-instant-credit-transfer-rulebook
+    local_instrument = fields.Selection(
+        selection_add=[('INST', 'Instant Transfer')])

account_banking_sepa_credit_transfer/models/account_payment_order.py

@@ -78,34 +78,37 @@ class AccountPaymentOrder(models.Model):
         transactions_count_a = 0
         amount_control_sum_a = 0.0
         lines_per_group = {}
-        # key = (requested_date, priority, local_instrument)
+        # key = (requested_date, priority, local_instrument, categ_purpose)
         # values = list of lines as object
         for line in self.bank_line_ids:
             priority = line.priority
             local_instrument = line.local_instrument
+            categ_purpose = line.category_purpose
             # The field line.date is the requested payment date
             # taking into account the 'date_prefered' setting
             # cf account_banking_payment_export/models/account_payment.py
             # in the inherit of action_open()
-            key = (line.date, priority, local_instrument)
+            key = (line.date, priority, local_instrument, categ_purpose)
             if key in lines_per_group:
                 lines_per_group[key].append(line)
             else:
                 lines_per_group[key] = [line]
-        for (requested_date, priority, local_instrument), lines in\
-                lines_per_group.items():
+        for (requested_date, priority, local_instrument, categ_purpose),\
+                lines in lines_per_group.items():
             # B. Payment info
             payment_info, nb_of_transactions_b, control_sum_b = \
                 self.generate_start_payment_info_block(
                     pain_root,
                     "self.name + '-' "
                     "+ requested_date.replace('-', '')  + '-' + priority + "
-                    "'-' + local_instrument",
-                    priority, local_instrument, False, requested_date, {
+                    "'-' + local_instrument + '-' + category_purpose",
+                    priority, local_instrument, categ_purpose,
+                    False, requested_date, {
                         'self': self,
                         'priority': priority,
                         'requested_date': requested_date,
                         'local_instrument': local_instrument or 'NOinstr',
+                        'category_purpose': categ_purpose or 'NOcateg',
                     }, gen_args)
             self.generate_party_block(
                 payment_info, 'Dbtr', 'B',