diff --git a/app/models/product.rb b/app/models/product.rb
index 2842f6365..fb60e7971 100644
--- a/app/models/product.rb
+++ b/app/models/product.rb
@@ -16,13 +16,21 @@ class Product < ApplicationRecord
            class_name: 'ProductsExtensionsAssociation',
            foreign_key: :product_id
 
-  has_many :extensions,
-           through: :extension_products_associations,
-           source: :extension
+  has_many :extensions, -> { distinct },
+    through: :extension_products_associations,
+    source: :extension do
+    def for_root_product(root_product)
+      where('products_extensions.root_product_id = %s', root_product.id)
+    end
+  end
 
   has_many :mirrored_extensions, -> { mirrored },
     through: :extension_products_associations,
-    source: :extension
+    source: :extension do
+    def for_root_product(root_product)
+      where('products_extensions.root_product_id = %s', root_product.id)
+    end
+  end
 
   has_and_belongs_to_many :predecessors, class_name: 'Product', join_table: :product_predecessors,
     association_foreign_key: :predecessor_id
diff --git a/app/models/products_extensions_association.rb b/app/models/products_extensions_association.rb
index 60bd09285..6b1994b2e 100644
--- a/app/models/products_extensions_association.rb
+++ b/app/models/products_extensions_association.rb
@@ -2,6 +2,7 @@ class ProductsExtensionsAssociation < ApplicationRecord
 
   self.table_name = 'products_extensions'
   belongs_to :product, class_name: 'Product', foreign_key: :product_id
+  belongs_to :root_product, class_name: 'Product', foreign_key: :root_product_id
   belongs_to :extension, class_name: 'Product', foreign_key: :extension_id
 
 end
diff --git a/app/serializers/v3/product_serializer.rb b/app/serializers/v3/product_serializer.rb
index bef0b0bf1..58927d2e3 100644
--- a/app/serializers/v3/product_serializer.rb
+++ b/app/serializers/v3/product_serializer.rb
@@ -14,7 +14,7 @@ def repositories
              :friendly_name, :product_class, :cpe, :free, :description, :eula_url, :repositories, :product_type, :extensions
 
   def extensions
-    object.mirrored_extensions.map do |extension|
+    object.mirrored_extensions.for_root_product(root_product).map do |extension|
       ::V3::ProductSerializer.new(extension, base_url: base_url).attributes
     end
   end
@@ -37,4 +37,8 @@ def free
     true
   end
 
+  def root_product
+    @instance_options[:root_product] ||= object
+  end
+
 end
diff --git a/db/migrate/20180102134941_add_root_and_recommended_to_products_extensions.rb b/db/migrate/20180102134941_add_root_and_recommended_to_products_extensions.rb
new file mode 100644
index 000000000..ca815c1ca
--- /dev/null
+++ b/db/migrate/20180102134941_add_root_and_recommended_to_products_extensions.rb
@@ -0,0 +1,22 @@
+class AddRootAndRecommendedToProductsExtensions < ActiveRecord::Migration[5.1]
+
+  def change
+    add_column :products_extensions, :recommended, :boolean
+    add_column :products_extensions, :root_product_id, :integer
+    add_index :products_extensions, %i[product_id extension_id root_product_id],
+              unique: true, name: 'index_products_extensions_on_product_extension_root'
+
+    reversible do |dir|
+      dir.up do
+        ProductsExtensionsAssociation.find_each.each do |pa|
+          base = pa.product
+          pa.root_product = base.bases.present? ? base.bases.first : base
+          pa.recommended = false
+          pa.save!
+        end
+        change_column_null(:products_extensions, :root_product_id, false)
+      end
+    end
+  end
+
+end
diff --git a/db/schema.rb b/db/schema.rb
index 890412e97..d07dc8b99 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20171214093115) do
+ActiveRecord::Schema.define(version: 20180102134941) do
 
   create_table "activations", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
     t.integer "service_id", null: false
@@ -56,7 +56,10 @@
   create_table "products_extensions", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
     t.bigint "product_id", null: false
     t.bigint "extension_id", null: false
+    t.boolean "recommended"
+    t.integer "root_product_id", null: false
     t.index ["extension_id"], name: "index_products_extensions_on_extension_id"
+    t.index ["product_id", "extension_id", "root_product_id"], name: "index_products_extensions_on_product_extension_root", unique: true
     t.index ["product_id"], name: "index_products_extensions_on_product_id"
   end
 
diff --git a/lib/rmt/scc.rb b/lib/rmt/scc.rb
index b00401a5d..d1be6c46b 100644
--- a/lib/rmt/scc.rb
+++ b/lib/rmt/scc.rb
@@ -126,6 +126,7 @@ def create_product(item)
       association = ProductsExtensionsAssociation.new
       association.product_id = product.id
       association.extension_id = extension.id
+      association.root_product_id = product.id # FIXME: correct root_product_id !!!
       association.save!
     end
 
diff --git a/spec/factories/products.rb b/spec/factories/products.rb
index 70b8e806a..d1448fa52 100644
--- a/spec/factories/products.rb
+++ b/spec/factories/products.rb
@@ -17,11 +17,15 @@
     transient do
       base_products []
       predecessor nil
+      root_product nil
     end
 
     after :create do |product, evaluator|
       evaluator.base_products.each do |base_product|
-        product.product_extensions_associations << ProductsExtensionsAssociation.create(product: base_product)
+        product.product_extensions_associations << ProductsExtensionsAssociation.create(
+          product: base_product,
+          root_product: evaluator.root_product || base_product
+        )
       end
 
       product.predecessors << evaluator.predecessor if evaluator.predecessor
@@ -38,8 +42,7 @@
     trait :with_extensions do
       after :create do |product, _evaluator|
         5.times do
-          extension = create :product, :extension
-          product.extensions << extension
+          create(:product, :extension, base_products: [product])
         end
       end
     end
@@ -47,8 +50,7 @@
     trait :with_mirrored_extensions do
       after :create do |product, _evaluator|
         5.times do
-          extension = create :product, :extension, :with_mirrored_repositories
-          product.extensions << extension
+          create(:product, :extension, :with_mirrored_repositories, base_products: [product])
         end
       end
     end
diff --git a/spec/models/product_spec.rb b/spec/models/product_spec.rb
index 5c628e7cd..3c39ff187 100644
--- a/spec/models/product_spec.rb
+++ b/spec/models/product_spec.rb
@@ -10,14 +10,14 @@
     subject { product.has_extension? }
 
     let(:product) { create :product }
-    let(:extension) { create :product }
+
 
     context 'when has no extensions' do
       it { is_expected.to eq false }
     end
 
     context 'when has extension' do
-      before { product.extensions << extension }
+      before { create(:product, :extension, base_products: [product]) }
       it { is_expected.to eq true }
     end
   end
@@ -65,4 +65,54 @@
       it { is_expected.to eq('42') }
     end
   end
+
+  describe '#extensions' do
+    let(:base_a) { FactoryGirl.create(:product) }
+    let(:base_b) { FactoryGirl.create(:product) }
+
+    let(:level_one_extension) { FactoryGirl.create(:product, :extension, base_products: [base_a, base_b]) }
+
+    let!(:level_two_extension_a) { FactoryGirl.create(:product, :extension, base_products: [level_one_extension], root_product: base_a) }
+    let!(:level_two_extension_b) { FactoryGirl.create(:product, :extension, base_products: [level_one_extension], root_product: base_b) }
+
+    it 'returns correct extensions for base A' do
+      expect(level_one_extension.extensions.for_root_product(base_a)).to eq([level_two_extension_a])
+    end
+
+    it 'returns correct extensions for base B' do
+      expect(level_one_extension.extensions.for_root_product(base_b)).to eq([level_two_extension_b])
+    end
+  end
+
+  describe '#mirrored_extensions' do
+    let(:base_a) { FactoryGirl.create(:product) }
+    let(:base_b) { FactoryGirl.create(:product) }
+
+    let(:level_one_extension) { FactoryGirl.create(:product, :extension, base_products: [base_a, base_b]) }
+
+    let(:level_two_extension_a_not_mirrored) { FactoryGirl.create(:product, :extension, base_products: [level_one_extension], root_product: base_a) }
+    let(:level_two_extension_b_not_mirrored) { FactoryGirl.create(:product, :extension, base_products: [level_one_extension], root_product: base_b) }
+
+    let(:level_two_extension_a_mirrored) do
+      FactoryGirl.create(:product, :extension, :with_mirrored_repositories, base_products: [level_one_extension], root_product: base_a)
+    end
+    let(:level_two_extension_b_mirrored) do
+      FactoryGirl.create(:product, :extension, :with_mirrored_repositories, base_products: [level_one_extension], root_product: base_b)
+    end
+
+    before do
+      level_two_extension_a_not_mirrored
+      level_two_extension_b_not_mirrored
+      level_two_extension_a_mirrored
+      level_two_extension_b_mirrored
+    end
+
+    it 'returns correct extensions for base A' do
+      expect(level_one_extension.mirrored_extensions.for_root_product(base_a)).to eq([level_two_extension_a_mirrored])
+    end
+
+    it 'returns correct extensions for base B' do
+      expect(level_one_extension.mirrored_extensions.for_root_product(base_b)).to eq([level_two_extension_b_mirrored])
+    end
+  end
 end
diff --git a/spec/requests/api/connect/v4/systems/products_controller_spec.rb b/spec/requests/api/connect/v4/systems/products_controller_spec.rb
index 3a0b1e7a0..c2e3bd332 100644
--- a/spec/requests/api/connect/v4/systems/products_controller_spec.rb
+++ b/spec/requests/api/connect/v4/systems/products_controller_spec.rb
@@ -53,10 +53,7 @@
       context 'has products depending on it and is activated' do
         let(:product) do
           product = FactoryGirl.create(:product, :extension, :with_mirrored_repositories, :activated, system: system)
-          ext_product = FactoryGirl.create(:product, :extension, :with_mirrored_repositories, :activated, system: system)
-          ext_product.bases << product
-          ext_product.save!
-
+          FactoryGirl.create(:product, :extension, :with_mirrored_repositories, :activated, system: system, base_products: [product])
           product
         end