diff --git a/app/views/spree/admin/parts/index.html.erb b/app/views/spree/admin/parts/index.html.erb
index 595a92b2..afaf7683 100644
--- a/app/views/spree/admin/parts/index.html.erb
+++ b/app/views/spree/admin/parts/index.html.erb
@@ -1,5 +1,3 @@
-<%= render :partial => 'spree/admin/shared/product_sub_menu' %>
-
 <%= render :partial => 'spree/admin/shared/product_tabs', :locals => {:current => "Parts"} %>
 <div id="product_parts">
   <%= render :partial => "parts_table", :locals => {:parts => @parts} %>
diff --git a/db/migrate/20140620223938_add_id_to_spree_assemblies_parts.rb b/db/migrate/20140620223938_add_id_to_spree_assemblies_parts.rb
index b074b316..969e4246 100644
--- a/db/migrate/20140620223938_add_id_to_spree_assemblies_parts.rb
+++ b/db/migrate/20140620223938_add_id_to_spree_assemblies_parts.rb
@@ -4,6 +4,6 @@ def up
   end
 
   def down
-    add_column :spree_assemblies_parts, :id
+    remove_column :spree_assemblies_parts, :id
   end
 end
diff --git a/spree_product_assembly.gemspec b/spree_product_assembly.gemspec
index 6d219255..95fb960b 100644
--- a/spree_product_assembly.gemspec
+++ b/spree_product_assembly.gemspec
@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
   s.platform    = Gem::Platform::RUBY
   s.name        = 'spree_product_assembly'
-  s.version     = '2.4.0.beta'
+  s.version     = '3.0.0.beta'
   s.summary     = 'Adds oportunity to make bundle of products to your Spree store'
   s.description = s.summary
   s.required_ruby_version = '>= 1.9.3'
@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
   s.require_path = 'lib'
   s.requirements << 'none'
 
-  s.add_dependency 'spree_backend', '~> 2.4.0'
+  s.add_dependency 'spree_backend', '~> 3.0.0'
 
   s.add_development_dependency 'rspec-rails', '~> 3.1.0'
   s.add_development_dependency 'sqlite3'