diff --git a/configuration.py b/configuration.py
index eab9e9f..817ee92 100644
--- a/configuration.py
+++ b/configuration.py
@@ -6,8 +6,6 @@ from trytond.pyson import Id
 from trytond.modules.company.model import (
     CompanyMultiValueMixin, CompanyValueMixin)
 
-__all__ = ['Configuration', 'ConfigurationSequence']
-
 
 class Configuration(
         ModelSingleton, ModelSQL, ModelView, CompanyMultiValueMixin):
diff --git a/edocument.py b/edocument.py
index 9036910..e4813fc 100644
--- a/edocument.py
+++ b/edocument.py
@@ -13,7 +13,6 @@ from io import open
 import oyaml as yaml
 import os
 
-__all__ = ['EdocumentMessage', 'EdocumentTemplate']
 
 KNOWN_EXTENSIONS = ['.txt', '.edi', '.pla']
 
@@ -285,7 +284,7 @@ class EdocumentExportMixin(object):
         edifact_receiver = [x for x in party.identifiers
             if x.type == 'EDI_receiver']
         if not edifact_receiver:
-            raise UserError(gettext('edocument_edifact.msg_EDI_receiver',
+            raise UserError(gettext('edocument_edifact.msg_party_EDI_receiver',
                 party=party.name))
         template, encoding = self._edi_template(message_type, party)
         loader = TextTemplate(template)
diff --git a/incoterm.py b/incoterm.py
index 53baaf4..42eee1f 100644
--- a/incoterm.py
+++ b/incoterm.py
@@ -3,8 +3,6 @@
 from trytond.model import fields
 from trytond.pool import PoolMeta
 
-__all__ = ['Rule']
-
 
 class Rule(metaclass=PoolMeta):
     __name__ = 'incoterm.rule'
diff --git a/locale/es.po b/locale/es.po
index 61cedac..850f1cb 100644
--- a/locale/es.po
+++ b/locale/es.po
@@ -18,7 +18,7 @@ msgctxt "model:ir.message,text:msg_EDI_sequence"
 msgid "EDI Sequence must be defined in Edocument Configuration."
 msgstr "Secuencia EDI debe definirse en Configuración de Documentación Electrónica."
 
-msgctxt "model:ir.message,text:msg_EDI_receiver"
+msgctxt "model:ir.message,text:msg_party_EDI_receiver"
 msgid "Party \"%(party)s\" lacks EDI receiver identifier."
 msgstr "El tercero \"%(party)s\" carece del identificador EDI de receptor"
 
@@ -26,6 +26,18 @@ msgctxt "model:ir.message,text:msg_EDI_export_path"
 msgid "EDI export path is not defined in Edocument Configuration."
 msgstr "Ruta de exportación EDI no está definida en Configuración de Documentación Electrónica."
 
+msgctxt "model:ir.message,text:msg_customer_unique"
+msgid "Cannot send invoices for more than 1 customer"
+msgstr "No se pueden enviar facturas a más de 1 cliente."
+
+msgctxt "model:ir.message,text:msg_shipment_customer_unique"
+msgid "Cannot send shipments for more than 1 customer"
+msgstr ""No se pueden enviar albaranes a más de 1 cliente.""
+
+msgctxt "model:ir.message,text:msg_customer_EDI_receiver"
+msgid "Customer \"%(customer)s\" lacks EDI receiver identifier"
+msgstr "El cliente \"%(customer)s\" no tiene identificador de receptor EDI."
+
 msgctxt "field:edocument.configuration,create_date:"
 msgid "Create Date"
 msgstr "Fecha de creación"
diff --git a/message.xml b/message.xml
index 6bb5cf7..a593da3 100644
--- a/message.xml
+++ b/message.xml
@@ -6,18 +6,27 @@ this repository contains the full copyright notices and license terms. -->
         <record model="ir.message" id="msg_company_unique">
             <field name="text">Cannot send invoices from more than 1 company.</field>
         </record>
+        <record model="ir.message" id="msg_customer_unique">
+            <field name="text">Cannot send invoices for more than 1 customer.</field>
+        </record>
+        <record model="ir.message" id="msg_shipment_customer_unique">
+            <field name="text">Cannot send shipments for more than 1 customer.</field>
+        </record>
         <record model="ir.message" id="msg_edi_party_message_type">
             <field name="text">Combination of message type and party must be unique.</field>
         </record>
         <record model="ir.message" id="msg_EDI_sender">
             <field name="text">Company "%(company)s" lacks EDI sender identifier.</field>
         </record>
+        <record model="ir.message" id="msg_party_EDI_receiver">
+            <field name="text">Party "%(party)s" lacks EDI receiver identifier.</field>
+        </record>
+        <record model="ir.message" id="msg_customer_EDI_receiver">
+            <field name="text">Customer "%(customer)s" lacks EDI receiver identifier.</field>
+        </record>
         <record model="ir.message" id="msg_EDI_sequence">
             <field name="text">EDI Sequence must be defined in Edocument Configuration.</field>
         </record>
-        <record model="ir.message" id="msg_EDI_receiver">
-            <field name="text">Party "%(party)s" lacks EDI receiver identifier.</field>
-        </record>
         <record model="ir.message" id="msg_EDI_export_path">
             <field name="text">EDI export path is not defined in Edocument Configuration.</field>
         </record>
diff --git a/party.py b/party.py
index da89581..dabdf3f 100644
--- a/party.py
+++ b/party.py
@@ -3,8 +3,6 @@
 from trytond.pool import PoolMeta
 from trytond.model import fields
 
-__all__ = ['Party', 'PartyIdentifier']
-
 
 class Party(metaclass=PoolMeta):
     __name__ = 'party.party'
diff --git a/product.py b/product.py
index f9fa356..38d8907 100644
--- a/product.py
+++ b/product.py
@@ -3,8 +3,6 @@
 from trytond.pool import PoolMeta
 from trytond.model import fields
 
-__all__ = ['Template', 'Product', 'Reference']
-
 
 class Template(metaclass=PoolMeta):
     __name__ = 'product.template'
diff --git a/stock.py b/stock.py
index ec15f77..f5d44e1 100644
--- a/stock.py
+++ b/stock.py
@@ -5,10 +5,6 @@ from trytond.pool import PoolMeta, Pool
 from trytond.pyson import Id
 from trytond.tools.multivalue import migrate_property
 from trytond.modules.company.model import CompanyValueMixin
-from trytond import backend
-
-__all__ = ['Configuration', 'ConfigurationSequence', 'UnitLoad',
-    'ConfigurationEDIOutputPath']
 
 
 class Configuration(metaclass=PoolMeta):
diff --git a/tryton.cfg b/tryton.cfg
index d2d97b8..daf7980 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -8,7 +8,7 @@ depends:
     product
     party_edi
 
-extras_depends:
+extras_depend:
     incoterm
     product_cross_reference