--- a/src/pyams_content/shared/resource/__init__.py	Fri Jan 04 17:15:18 2019 +0100
+++ b/src/pyams_content/shared/resource/__init__.py	Sun Jan 06 18:39:25 2019 +0100
@@ -63,13 +63,13 @@
     series = FieldProperty(IResourceInfo['series'])
     volume = FieldProperty(IResourceInfo['volume'])
     format = FieldProperty(IResourceInfo['format'])
+    nb_pages = FieldProperty(IResourceInfo['nb_pages'])
     release_year = FieldProperty(IResourceInfo['release_year'])
     awards = FieldProperty(IResourceInfo['awards'])
-    nb_pages = FieldProperty(IResourceInfo['nb_pages'])
     editor_reference = FieldProperty(IResourceInfo['editor_reference'])
     isbn_number = FieldProperty(IResourceInfo['isbn_number'])
+    price = FieldProperty(IResourceInfo['price'])
     source_url = FieldProperty(IResourceInfo['source_url'])
-    price = FieldProperty(IResourceInfo['price'])
     summary = FieldProperty(IResourceInfo['summary'])
     synopsis = FieldProperty(IResourceInfo['synopsis'])
     publisher_words = FieldProperty(IResourceInfo['publisher_words'])

--- a/src/pyams_content/shared/resource/interfaces.py	Fri Jan 04 17:15:18 2019 +0100
+++ b/src/pyams_content/shared/resource/interfaces.py	Sun Jan 06 18:39:25 2019 +0100
@@ -103,6 +103,10 @@
     format = TextLine(title=_("Format"),
                       required=False)
 
+    nb_pages = Int(title=_("Nb pages"),
+                   min=0,
+                   required=False)
+
     release_year = Choice(title=_("Release year"),
                           values=range(datetime.today().year, 1970, -1),
                           required=False)
@@ -110,24 +114,20 @@
     awards = I18nTextField(title=_("Awards"),
                            required=False)
 
-    nb_pages = Int(title=_("Nb pages"),
-                   min=0,
-                   required=False)
-
     editor_reference = TextLine(title=_("Editor reference"),
                                 required=False)
 
     isbn_number = TextLine(title=_("ISBN number"),
                            required=False)
 
+    price = Float(title=_("Price"),
+                  min=0.0,
+                  required=False)
+
     source_url = URI(title=_("Source URI"),
                      description=_("External URL used to get more information about resource"),
                      required=False)
 
-    price = Float(title=_("Price"),
-                  min=0.0,
-                  required=False)
-
     summary = I18nHTMLField(title=_("Summary"),
                             required=False)