Cancel kind of works (reverts but leaves in new fields :-( )

Filter out system metadata fields

cms/djangoapps/models/settings/course_metadata.py

 from xmodule.modulestore import Location
 from contentstore.utils import get_modulestore
+from xmodule.x_module import XModuleDescriptor
 
 
 class CourseMetadata(object):
@@ -8,7 +9,7 @@ class CourseMetadata(object):
     The objects have no predefined attrs but instead are obj encodings of the editable metadata.
     '''
     # __new_advanced_key__ is used by client not server; so, could argue against it being here
-    FILTERED_LIST = ['start', 'end', 'enrollment_start', 'enrollment_end', 'tabs', 'graceperiod', '__new_advanced_key__']
+    FILTERED_LIST = XModuleDescriptor.system_metadata_fields + ['start', 'end', 'enrollment_start', 'enrollment_end', 'tabs', 'graceperiod', '__new_advanced_key__']
     
     @classmethod
     def fetch(cls, course_location):

cms/static/js/models/settings/advanced.js

@@ -123,7 +123,7 @@ CMS.Views.Settings.Advanced = CMS.Views.ValidatingView.extend({
         this.model.deleteKeys = [];
         var self = this;
         this.model.fetch({
-            success : this.render,
+            success : function() { self.render(); },
             error : CMS.ServerError
         });
     },