diff --git a/app/models/issue.rb b/app/models/issue.rb
index 7d2dd413c..f7b2f8a36 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -78,7 +78,7 @@ class Issue < ActiveRecord::Base
   
   def copy_from(arg)
     issue = arg.is_a?(Issue) ? arg : Issue.find(arg)
-    self.attributes = issue.attributes.dup
+    self.attributes = issue.attributes.dup.except("id", "created_on", "updated_on")
     self.custom_values = issue.custom_values.collect {|v| v.clone}
     self
   end
diff --git a/app/models/project.rb b/app/models/project.rb
index 3fcedcae8..8b591a68c 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -455,8 +455,8 @@ class Project < ActiveRecord::Base
       self.wiki ||= Wiki.new
       wiki.attributes = project.wiki.attributes.dup.except("id", "project_id")
       project.wiki.pages.each do |page|
-        new_wiki_content = WikiContent.new(page.content.attributes.dup.except("id", "page_id"))
-        new_wiki_page = WikiPage.new(page.attributes.dup.except("id", "wiki_id"))
+        new_wiki_content = WikiContent.new(page.content.attributes.dup.except("id", "page_id", "updated_on"))
+        new_wiki_page = WikiPage.new(page.attributes.dup.except("id", "wiki_id", "created_on", "parent_id"))
         new_wiki_page.content = new_wiki_content
         wiki.pages << new_wiki_page
       end
@@ -467,7 +467,7 @@ class Project < ActiveRecord::Base
   def copy_versions(project)
     project.versions.each do |version|
       new_version = Version.new
-      new_version.attributes = version.attributes.dup.except("id", "project_id")
+      new_version.attributes = version.attributes.dup.except("id", "project_id", "created_on", "updated_on")
       self.versions << new_version
     end
   end
@@ -504,7 +504,7 @@ class Project < ActiveRecord::Base
   def copy_members(project)
     project.members.each do |member|
       new_member = Member.new
-      new_member.attributes = member.attributes.dup.except("id", "project_id")
+      new_member.attributes = member.attributes.dup.except("id", "project_id", "created_on")
       new_member.role_ids = member.role_ids.dup
       new_member.project = self
       self.members << new_member