add bank account number to xml-export

mixin.py

@@ -9,6 +9,7 @@ import html
 from trytond.exceptions import UserError
 from trytond.i18n import gettext
 from trytond.tools import cached_property
+from trytond.pool import Pool
 
 
 class EdocumentMixin(object):
@@ -16,6 +17,25 @@ class EdocumentMixin(object):
     """
     __slots__ = ()
 
+    def company_bank_accounts(self):
+        """ get leist of bank account numbers, defined in config
+
+        Returns:
+            list: records of model bank.account.number
+        """
+        Configuration = Pool().get('account.configuration')
+
+        result = []
+        cfg1 = Configuration.get_singleton()
+        if cfg1 and cfg1.edocument_bank:
+            result.extend(list(cfg1.edocument_bank))
+        else:
+            result.extend([
+                y
+                for x in self.company.party.bank_accounts
+                for y in x.numbers])
+        return result
+
     @cached_property
     def seller_trade_address(self):
         """ get address of seller, throw exception if incomplete