diff -r 0505d35a472d -r 66baddd786d5 src/pyams_content/component/extfile/zmi/__init__.py
--- a/src/pyams_content/component/extfile/zmi/__init__.py	Thu Jun 02 15:18:57 2016 +0200
+++ b/src/pyams_content/component/extfile/zmi/__init__.py	Thu Jun 02 15:20:41 2016 +0200
@@ -9,8 +9,6 @@
 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
 # FOR A PARTICULAR PURPOSE.
 #
-from pyams_content.interfaces import MANAGE_CONTENT_PERMISSION
-from pyams_utils.interfaces import VIEW_SYSTEM_PERMISSION
 
 __docformat__ = 'restructuredtext'
 
@@ -18,12 +16,14 @@
 # import standard library
 
 # import interfaces
-from pyams_content.component.extfile.interfaces import IExtFileContainer, IExtFileContainerTarget, IBaseExtFile, IExtFile, \
-    IExtImage
+from pyams_content.component.extfile.interfaces import IExtFileContainer, IExtFileContainerTarget, IBaseExtFile, \
+    IExtFile, IExtImage
+from pyams_content.interfaces import MANAGE_CONTENT_PERMISSION
 from pyams_file.interfaces import IFileInfo
 from pyams_i18n.interfaces import INegotiator, II18n
 from pyams_skin.interfaces.viewlet import IWidgetTitleViewletManager
 from pyams_skin.layer import IPyAMSLayer
+from pyams_utils.interfaces import VIEW_SYSTEM_PERMISSION
 from z3c.form.interfaces import NOT_CHANGED
 
 # import packages