diff --git a/app/controllers/new_administrateur/types_de_champ_controller.rb b/app/controllers/new_administrateur/types_de_champ_controller.rb
index b88cb1642..ea7023757 100644
--- a/app/controllers/new_administrateur/types_de_champ_controller.rb
+++ b/app/controllers/new_administrateur/types_de_champ_controller.rb
@@ -44,7 +44,6 @@ module NewAdministrateur
       {
         type_de_champ: type_de_champ.as_json(
           except: [
-            :id,
             :created_at,
             :options,
             :order_place,
@@ -64,7 +63,7 @@ module NewAdministrateur
             :piece_justificative_template_url,
             :quartiers_prioritaires
           ]
-        ).merge(id: TypeDeChamp.format_stable_id(type_de_champ.stable_id))
+        )
       }
     end
 
diff --git a/app/models/champ.rb b/app/models/champ.rb
index b4231596c..a4f5b35ad 100644
--- a/app/models/champ.rb
+++ b/app/models/champ.rb
@@ -48,7 +48,13 @@ class Champ < ApplicationRecord
   scope :private_only, -> { where(private: true) }
   scope :ordered, -> { includes(:type_de_champ).order(:row, 'types_de_champ.order_place') }
   scope :public_ordered, -> { public_only.joins(dossier: { revision: :revision_types_de_champ }).where('procedure_revision_types_de_champ.type_de_champ_id = champs.type_de_champ_id').order(:position) }
-  scope :private_ordered, -> { private_only.joins(dossier: { revision: :revision_types_de_champ_private }).where('procedure_revision_types_de_champ.type_de_champ_id = champs.type_de_champ_id').order(:position) }
+  # we need to do private champs order as manual join to avoid conflicting join names
+  scope :private_ordered, -> do
+    private_only.joins('INNER JOIN types_de_champ types_de_champ_private
+      ON types_de_champ_private.id = champs.type_de_champ_id AND types_de_champ_private.private = true
+      INNER JOIN procedure_revision_types_de_champ procedure_revision_types_de_champ_private
+      ON procedure_revision_types_de_champ_private.type_de_champ_id = types_de_champ_private.id').order(:position)
+  end
 
   scope :root, -> { where(parent_id: nil) }
 
diff --git a/app/models/type_de_champ.rb b/app/models/type_de_champ.rb
index e0ff6990d..a3ee48103 100644
--- a/app/models/type_de_champ.rb
+++ b/app/models/type_de_champ.rb
@@ -2,20 +2,19 @@
 #
 # Table name: types_de_champ
 #
-#  id           :integer          not null, primary key
-#  description  :text
-#  libelle      :string
-#  mandatory    :boolean          default(FALSE)
-#  options      :jsonb
-#  order_place  :integer
-#  private      :boolean          default(FALSE), not null
-#  type_champ   :string
-#  created_at   :datetime
-#  updated_at   :datetime
-#  parent_id    :bigint
-#  procedure_id :integer
-#  revision_id  :bigint
-#  stable_id    :bigint
+#  id          :integer          not null, primary key
+#  description :text
+#  libelle     :string
+#  mandatory   :boolean          default(FALSE)
+#  options     :jsonb
+#  order_place :integer
+#  private     :boolean          default(FALSE), not null
+#  type_champ  :string
+#  created_at  :datetime
+#  updated_at  :datetime
+#  parent_id   :bigint
+#  revision_id :bigint
+#  stable_id   :bigint
 #
 class TypeDeChamp < ApplicationRecord
   self.ignored_columns = ['procedure_id']
@@ -304,7 +303,7 @@ class TypeDeChamp < ApplicationRecord
 
   def read_attribute_for_serialization(name)
     if name == 'id'
-      self.class.format_stable_id(stable_id)
+      stable_id
     else
       super
     end
@@ -317,15 +316,11 @@ class TypeDeChamp < ApplicationRecord
   # This is only needed for a clean migration without downtime. We want to ensure
   # that if editor send a simple id because it was loaded before deployment
   # we would still do the right thing.
-  def self.format_stable_id(stable_id)
-    "stable:#{stable_id}"
-  end
-
   def self.to_stable_id(id_or_stable_id)
     if id_or_stable_id.to_s =~ /^stable:/
       id_or_stable_id.to_s.gsub(/^stable:/, '')
     else
-      find(id_or_stable_id).stable_id
+      id_or_stable_id
     end
   end
 
diff --git a/db/migrate/20200902103047_remove_type_de_champ_procedure_id.rb b/db/migrate/20200902103047_remove_type_de_champ_procedure_id.rb
new file mode 100644
index 000000000..8a4f5fba7
--- /dev/null
+++ b/db/migrate/20200902103047_remove_type_de_champ_procedure_id.rb
@@ -0,0 +1,5 @@
+class RemoveTypeDeChampProcedureId < ActiveRecord::Migration[6.0]
+  def change
+    remove_column :types_de_champ, :procedure_id
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 985446dae..2c5243048 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: 2020_08_19_153016) do
+ActiveRecord::Schema.define(version: 2020_09_02_103047) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -611,7 +611,6 @@ ActiveRecord::Schema.define(version: 2020_08_19_153016) do
     t.string "libelle"
     t.string "type_champ"
     t.integer "order_place"
-    t.integer "procedure_id"
     t.text "description"
     t.boolean "mandatory", default: false
     t.boolean "private", default: false, null: false
@@ -623,7 +622,6 @@ ActiveRecord::Schema.define(version: 2020_08_19_153016) do
     t.bigint "revision_id"
     t.index ["parent_id"], name: "index_types_de_champ_on_parent_id"
     t.index ["private"], name: "index_types_de_champ_on_private"
-    t.index ["procedure_id"], name: "index_types_de_champ_on_procedure_id"
     t.index ["revision_id"], name: "index_types_de_champ_on_revision_id"
     t.index ["stable_id"], name: "index_types_de_champ_on_stable_id"
   end