diff --git a/account_invoice_import/wizard/account_invoice_import.py b/account_invoice_import/wizard/account_invoice_import.py
index 1c85584456..8fcbe2a358 100644
--- a/account_invoice_import/wizard/account_invoice_import.py
+++ b/account_invoice_import/wizard/account_invoice_import.py
@@ -441,7 +441,6 @@ def _create_invoice(self, parsed_inv):
 
     @api.model
     def post_process_invoice(self, parsed_inv, invoice):
-        self.ensure_one()
         invoice.button_reset_taxes()
         # Force tax amount if necessary
         prec = self.env['decimal.precision'].precision_get('Account')
diff --git a/account_invoice_import_invoice2data/wizard/account_invoice_import.py b/account_invoice_import_invoice2data/wizard/account_invoice_import.py
index 6e23904332..73de4b6220 100644
--- a/account_invoice_import_invoice2data/wizard/account_invoice_import.py
+++ b/account_invoice_import_invoice2data/wizard/account_invoice_import.py
@@ -6,14 +6,17 @@
 from openerp.exceptions import Warning as UserError
 import os
 from tempfile import mkstemp
-import logging
-from invoice2data.main import extract_data
-from invoice2data.template import read_templates
-from invoice2data.main import logger as loggeri2data
 import pkg_resources
-
+import logging
 logger = logging.getLogger(__name__)
 
+try:
+    from invoice2data.main import extract_data
+    from invoice2data.template import read_templates
+    from invoice2data.main import logger as loggeri2data
+except ImportError:
+    logger.debug('Cannot import invoice2data')
+
 
 class AccountInvoiceImport(models.TransientModel):
     _inherit = 'account.invoice.import'
diff --git a/account_invoice_zugferd/models/account_invoice.py b/account_invoice_zugferd/models/account_invoice.py
index f105762a73..62ce7a5973 100644
--- a/account_invoice_zugferd/models/account_invoice.py
+++ b/account_invoice_zugferd/models/account_invoice.py
@@ -8,15 +8,19 @@
 from openerp.tools import float_compare, float_is_zero, float_round
 from StringIO import StringIO
 from lxml import etree
-from PyPDF2 import PdfFileWriter, PdfFileReader
-from PyPDF2.generic import DictionaryObject, DecodedStreamObject,\
-    NameObject, createStringObject, ArrayObject
 from tempfile import NamedTemporaryFile
 from datetime import datetime
 import logging
-# from pprint import pprint
-
 logger = logging.getLogger(__name__)
+
+try:
+    from PyPDF2 import PdfFileWriter, PdfFileReader
+    from PyPDF2.generic import DictionaryObject, DecodedStreamObject,\
+        NameObject, createStringObject, ArrayObject
+except ImportError:
+    logger.debug('Cannot import PyPDF2')
+
+
 ZUGFERD_LEVEL = 'comfort'
 ZUGFERD_FILENAME = 'ZUGFeRD-invoice.xml'
 
diff --git a/base_business_document_import/models/business_document_import.py b/base_business_document_import/models/business_document_import.py
index e69e0e0890..33ee3cdba4 100644
--- a/base_business_document_import/models/business_document_import.py
+++ b/base_business_document_import/models/business_document_import.py
@@ -5,15 +5,18 @@
 from openerp import models, api, _
 from openerp.tools import float_compare
 from openerp.exceptions import Warning as UserError
-import PyPDF2
 from lxml import etree
 from StringIO import StringIO
 import mimetypes
 from urlparse import urlparse
 import logging
-
 logger = logging.getLogger(__name__)
 
+try:
+    import PyPDF2
+except ImportError:
+    logger.debug('Cannot import PyPDF2')
+
 
 class BusinessDocumentImport(models.AbstractModel):
     _name = 'business.document.import'
diff --git a/base_business_document_import_phone/models/business_document_import.py b/base_business_document_import_phone/models/business_document_import.py
index 8205e5458a..cc3cce593c 100644
--- a/base_business_document_import_phone/models/business_document_import.py
+++ b/base_business_document_import_phone/models/business_document_import.py
@@ -8,7 +8,7 @@
 try:
     import phonenumbers
 except ImportError:
-    logger.warning('Cannot import phonenumbers')
+    logger.debug('Cannot import phonenumbers')
 
 
 class BusinessDocumentImport(models.AbstractModel):
diff --git a/base_ubl/models/ubl.py b/base_ubl/models/ubl.py
index 6163aa4ddb..4c9829b0c7 100644
--- a/base_ubl/models/ubl.py
+++ b/base_ubl/models/ubl.py
@@ -8,12 +8,15 @@
 from lxml import etree
 from StringIO import StringIO
 from tempfile import NamedTemporaryFile
-import PyPDF2
 import mimetypes
 import logging
-
 logger = logging.getLogger(__name__)
 
+try:
+    import PyPDF2
+except ImportError:
+    logger.debug('Cannot import PyPDF2')
+
 
 class BaseUbl(models.AbstractModel):
     _name = 'base.ubl'
diff --git a/sale_order_import_csv/wizard/sale_order_import.py b/sale_order_import_csv/wizard/sale_order_import.py
index df0198a30e..bfc2c0fe4c 100644
--- a/sale_order_import_csv/wizard/sale_order_import.py
+++ b/sale_order_import_csv/wizard/sale_order_import.py
@@ -6,10 +6,12 @@
 from openerp.exceptions import Warning as UserError
 from openerp.tools import float_compare
 from tempfile import TemporaryFile
-import unicodecsv
 import logging
-
 logger = logging.getLogger(__name__)
+try:
+    import unicodecsv
+except ImportError:
+    logger.debug('Cannot import unicodecsv')
 
 
 class SaleOrderImport(models.TransientModel):