configuration: add setting for used bank nuumbers

configuration.py

@@ -0,0 +1,35 @@
+# -*- coding: utf-8 -*-
+# This file is part of the edocument-module for Tryton from m-ds.de.
+# The COPYRIGHT file at the top level of this repository contains the
+# full copyright notices and license terms.
+
+
+from trytond.pool import PoolMeta
+from trytond.model import ModelSQL, fields
+
+
+class Configuration(metaclass=PoolMeta):
+    __name__ = 'account.configuration'
+
+    edocument_bank = fields.Many2Many(
+        string='Bank accounts',
+        relation_name='edocument_xrechnung.bank_rel',
+        origin='config', target='bankaccount',
+        filter=[('company_owned', '=', True)],
+        help='The bank accounts listed here are output in the invoice XML.')
+
+# end Configuration
+
+
+class BankEdocumentRel(ModelSQL):
+    'Bank - eDocument - Relation'
+    __name__ = 'edocument_xrechnung.bank_rel'
+
+    bankaccount = fields.Many2One(
+        string='Account', model_name='bank.account.number',
+        required=True, ondelete='CASCADE')
+    config = fields.Many2One(
+        string='Configuration', model_name='account.configuration',
+        required=True, ondelete='CASCADE')
+
+# end BankEdocumentRel