diff --git a/app/models/procedure.rb b/app/models/procedure.rb
index e1d9b0176..ad992d2c6 100644
--- a/app/models/procedure.rb
+++ b/app/models/procedure.rb
@@ -226,7 +226,7 @@ class Procedure < ApplicationRecord
   enum closing_reason: {
     internal_procedure: 'internal_procedure',
     other: 'other'
-  }
+  }, _prefix: true
 
   scope :for_api_v2, -> {
     includes(:draft_revision, :published_revision, administrateurs: :user)
@@ -265,8 +265,7 @@ class Procedure < ApplicationRecord
 
   validate :check_juridique, on: [:create, :publication]
 
-  # TO DO add validation after data backfill
-  # validates :replaced_by_id, presence: true, if: -> { closing_reason == self.closing_reasons.fetch(:internal_procedure) }
+  validates :replaced_by_procedure_id, presence: true, if: :closing_reason_internal_procedure?
 
   validates :path, presence: true, format: { with: /\A[a-z0-9_\-]{3,200}\z/ }, uniqueness: { scope: [:path, :closed_at, :hidden_at, :unpublished_at], case_sensitive: false }
   validates :duree_conservation_dossiers_dans_ds, allow_nil: false,
diff --git a/app/tasks/maintenance/update_closing_reason_if_no_replaced_by_id_task.rb b/app/tasks/maintenance/update_closing_reason_if_no_replaced_by_id_task.rb
new file mode 100644
index 000000000..daf013ca0
--- /dev/null
+++ b/app/tasks/maintenance/update_closing_reason_if_no_replaced_by_id_task.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module Maintenance
+  class UpdateClosingReasonIfNoReplacedByIdTask < MaintenanceTasks::Task
+    def collection
+      Procedure
+        .with_discarded
+        .closes
+        .where(closing_reason: Procedure.closing_reasons.fetch(:internal_procedure))
+        .where(replaced_by_procedure_id: nil)
+    end
+
+    def process(procedure)
+      procedure.closing_reason_other!
+    end
+  end
+end
diff --git a/app/views/administrateurs/procedures/closing_notification.html.haml b/app/views/administrateurs/procedures/closing_notification.html.haml
index 36c9f0e77..acd58b10e 100644
--- a/app/views/administrateurs/procedures/closing_notification.html.haml
+++ b/app/views/administrateurs/procedures/closing_notification.html.haml
@@ -7,7 +7,7 @@
   .fr-grid-row
     .fr-col-12.fr-col-offset-md-2.fr-col-md-8
       %h1= t('administrateurs.procedures.closing_notification.page_title')
-      - if @procedure.closing_reason == Procedure.closing_reasons.fetch(:other)
+      - if @procedure.closing_reason_other?
         %h2.fr-h5= I18n.t('administrateurs.procedures.closing_notification.page_subtitle', closing_path: closing_details_path(@procedure.path)).html_safe
       - else
         %h2.fr-h5= I18n.t('administrateurs.procedures.closing_notification.page_subtitle_with_redirection', redirection_path: commencer_path(@procedure.replaced_by_procedure.path)).html_safe
diff --git a/app/views/administrateurs/procedures/show.html.haml b/app/views/administrateurs/procedures/show.html.haml
index 4856331ab..446f37d1c 100644
--- a/app/views/administrateurs/procedures/show.html.haml
+++ b/app/views/administrateurs/procedures/show.html.haml
@@ -58,7 +58,7 @@
           - new_procedure = Procedure.find_by(id: @procedure.replaced_by_procedure_id)
           %p
             = "Cette démarche est remplacée par une autre démarche dans Démarches simplifiées :"
-            = link_to(new_procedure&.libelle, admin_procedure_path(new_procedure))
+            = link_to(new_procedure.libelle, admin_procedure_path(new_procedure))
         - if @procedure.closing_reason == 'other'
           %p
             = "Plus d'informations dans la #{link_to('page de fermeture', closing_details_path(@procedure.path))}, visible par les usagers."
diff --git a/app/views/users/dossiers/_dossiers_list.html.haml b/app/views/users/dossiers/_dossiers_list.html.haml
index ea6e62933..432dc5239 100644
--- a/app/views/users/dossiers/_dossiers_list.html.haml
+++ b/app/views/users/dossiers/_dossiers_list.html.haml
@@ -54,13 +54,13 @@
         = render Dsfr::AlertComponent.new(state: :info, size: :sm, extra_class_names: "fr-mb-2w") do |c|
           - c.with_body do
             %p
-              - if dossier.brouillon? && dossier.procedure.closing_reason == Procedure.closing_reasons.fetch(:internal_procedure)
+              - if dossier.brouillon? && dossier.procedure.closing_reason_internal_procedure?
                 = I18n.t('views.users.dossiers.dossiers_list.procedure_closed.brouillon.internal_procedure', link: commencer_path(dossier.procedure.replaced_by_procedure.path)).html_safe
-              - elsif dossier.brouillon? && dossier.procedure.closing_reason == Procedure.closing_reasons.fetch(:other)
+              - elsif dossier.brouillon? && dossier.procedure.closing_reason_other?
                 = I18n.t('views.users.dossiers.dossiers_list.procedure_closed.brouillon.other', link: closing_details_path(dossier.procedure.path)).html_safe
-              - elsif (dossier.en_construction? || dossier.en_instruction?) && dossier.procedure.closing_reason == Procedure.closing_reasons.fetch(:internal_procedure)
+              - elsif (dossier.en_construction? || dossier.en_instruction?) && dossier.procedure.closing_reason_internal_procedure?
                 = I18n.t('views.users.dossiers.dossiers_list.procedure_closed.en_cours.internal_procedure')
-              - elsif (dossier.en_construction? || dossier.en_instruction?) && dossier.procedure.closing_reason == Procedure.closing_reasons.fetch(:other)
+              - elsif (dossier.en_construction? || dossier.en_instruction?) && dossier.procedure.closing_reason_other?
                 = I18n.t('views.users.dossiers.dossiers_list.procedure_closed.en_cours.other', link: closing_details_path(dossier.procedure.path)).html_safe
 
       - if dossier.pending_correction?
diff --git a/spec/controllers/administrateurs/procedures_controller_spec.rb b/spec/controllers/administrateurs/procedures_controller_spec.rb
index 8c3f651e3..72d2484e0 100644
--- a/spec/controllers/administrateurs/procedures_controller_spec.rb
+++ b/spec/controllers/administrateurs/procedures_controller_spec.rb
@@ -803,9 +803,10 @@ describe Administrateurs::ProceduresController, type: :controller do
         procedure.reload
       end
 
-      it 'closes the procedure without redirection to the new procedure in DS' do
-        expect(response).to redirect_to admin_procedure_path(procedure.id)
-        expect(flash[:notice]).to have_content 'Démarche close'
+      it 'does not close the procedure' do
+        expect(response).to redirect_to admin_procedure_close_path
+        expect(flash[:alert]).to have_content 'Le champ « Nouvelle démarche » doit être rempli'
+        expect(procedure.close?).to be_falsey
         expect(procedure.replaced_by_procedure).to eq(nil)
       end
     end
diff --git a/spec/tasks/maintenance/update_closing_reason_if_no_replaced_by_id_task_spec.rb b/spec/tasks/maintenance/update_closing_reason_if_no_replaced_by_id_task_spec.rb
new file mode 100644
index 000000000..a535fdecd
--- /dev/null
+++ b/spec/tasks/maintenance/update_closing_reason_if_no_replaced_by_id_task_spec.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+module Maintenance
+  RSpec.describe UpdateClosingReasonIfNoReplacedByIdTask do
+    describe "#process" do
+      subject(:process) { described_class.process(procedure) }
+
+      let(:procedure) { create(:procedure, :closed) }
+
+      before do
+        procedure.update_column(:closing_reason, Procedure.closing_reasons.fetch(:internal_procedure))
+        procedure.update_column(:replaced_by_procedure_id, nil)
+      end
+
+      it 'updates closing_reason to other' do
+        subject
+        expect(procedure.closing_reason).to eq(Procedure.closing_reasons.fetch(:other))
+      end
+    end
+  end
+end