[MIG] account_banking_sepa_direct_debit: Finish migration to 12.0

* Fixed tests
* Adjust code for Python dates handling
* Update copyrights

account_payment_order/models/account_move_line.py

@@ -43,6 +43,9 @@ class AccountMoveLine(models.Model):
                         self.invoice_id.type in ('in_invoice', 'in_refund') and
                         self.invoice_id.reference):
                     communication = self.invoice_id.reference
+                elif 'out' in self.invoice_id.type:
+                    # Force to only put invoice number here
+                    communication = self.invoice_id.number
         if self.currency_id:
             currency_id = self.currency_id.id
             amount_currency = self.amount_residual_currency

account_payment_order/models/bank_payment_line.py

@@ -1,4 +1,5 @@
-# © 2015-2016 Akretion - Alexis de Lattre <alexis.delattre@akretion.com>
+# Copyright 2015-2016 Akretion - Alexis de Lattre
+# Copyright 2018 Tecnativa - Pedro M. Baeza
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
 
 from odoo import models, fields, api, _
@@ -101,7 +102,7 @@ class BankPaymentLine(models.Model):
         """
         self.ensure_one()
         if self.order_id.payment_mode_id.move_option == 'date':
-            hashcode = self.date
+            hashcode = fields.Date.to_string(self.date)
         else:
             hashcode = str(self.id)
         return hashcode