diff --git a/app/components/dossiers/errors_full_messages_component.rb b/app/components/dossiers/errors_full_messages_component.rb
index fd8bafd94a7..1ae164c81cf 100644
--- a/app/components/dossiers/errors_full_messages_component.rb
+++ b/app/components/dossiers/errors_full_messages_component.rb
@@ -3,13 +3,12 @@
 class Dossiers::ErrorsFullMessagesComponent < ApplicationComponent
   ErrorDescriptor = Data.define(:anchor, :label, :error_message)
 
-  def initialize(dossier:, errors:)
+  def initialize(dossier:)
     @dossier = dossier
-    @errors = errors
   end
 
   def dedup_and_partitioned_errors
-    formated_errors = @errors.to_enum # ActiveModel::Errors.to_a is an alias to full_messages, we don't want that
+    formated_errors = @dossier.errors.to_enum # ActiveModel::Errors.to_a is an alias to full_messages, we don't want that
       .to_a # but enum.to_a gives back an array
       .uniq { |error| [error.inner_error.base] } # dedup cumulated errors from dossier.champs, dossier.champs_public, dossier.champs_private which run the validator one time per association
       .map { |error| to_error_descriptor(error) }
@@ -27,6 +26,6 @@ def to_error_descriptor(error)
   end
 
   def render?
-    !@errors.empty?
+    !@dossier.errors.empty?
   end
 end
diff --git a/app/controllers/users/dossiers_controller.rb b/app/controllers/users/dossiers_controller.rb
index a8ffc0a8e9c..674d01329b8 100644
--- a/app/controllers/users/dossiers_controller.rb
+++ b/app/controllers/users/dossiers_controller.rb
@@ -229,9 +229,9 @@ def brouillon
 
     def submit_brouillon
       @dossier = dossier_with_champs(pj_template: false)
-      @errors = submit_dossier_and_compute_errors
+      submit_dossier_and_compute_errors
 
-      if @errors.blank?
+      if @dossier.errors.blank? && @dossier.can_passer_en_construction?
         @dossier.passer_en_construction!
         @dossier.process_declarative!
         @dossier.process_sva_svr!
@@ -240,6 +240,7 @@ def submit_brouillon
         end
         redirect_to merci_dossier_path(@dossier)
       else
+        @dossier.check_in_eligibilite_rules_and_visible_champs if !@dossier.can_passer_en_construction?
         respond_to do |format|
           format.html { render :brouillon }
           format.turbo_stream
@@ -276,17 +277,17 @@ def submit_en_construction
         editing_fork_origin.resolve_pending_correction
       end
 
-      @errors = submit_dossier_and_compute_errors
+      submit_dossier_and_compute_errors
 
-      if @errors.blank?
+      if @dossier.errors.blank? && @dossier.can_passer_en_construction?
         editing_fork_origin.merge_fork(@dossier)
         editing_fork_origin.submit_en_construction!
 
         redirect_to dossier_path(editing_fork_origin)
       else
+        @dossier.check_in_eligibilite_rules_and_visible_champs if !@dossier.can_passer_en_construction?
         respond_to do |format|
           format.html do
-            @dossier = editing_fork_origin
             render :modifier
           end
 
@@ -574,21 +575,14 @@ def update_dossier_and_compute_errors
 
     def submit_dossier_and_compute_errors
       @dossier.validate(:champs_public_value)
-
-      errors = @dossier.errors
-      @dossier.check_mandatory_and_visible_champs.each do |error_on_champ|
-        errors.import(error_on_champ)
-      end
+      @dossier.check_mandatory_and_visible_champs
 
       if @dossier.editing_fork_origin&.pending_correction?
         @dossier.editing_fork_origin.validate(:champs_public_value)
         @dossier.editing_fork_origin.errors.where(:pending_correction).each do |error|
-          errors.import(error)
+          @dossier.errors.import(error)
         end
-
       end
-
-      errors
     end
 
     def ensure_ownership!
diff --git a/app/models/champ.rb b/app/models/champ.rb
index 2cb0bb4ec46..0b28c2ca93a 100644
--- a/app/models/champ.rb
+++ b/app/models/champ.rb
@@ -102,6 +102,10 @@ def mandatory_blank?
     mandatory? && blank?
   end
 
+  def in_eligibilite_rules?
+    blank? && stable_id.in?(dossier.revision&.eligibilite_rules&.sources || [])
+  end
+
   def blank?
     value.blank?
   end
diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index 86962ec8952..f47e9c75d4c 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -935,13 +935,25 @@ def remove_titres_identite!
   end
 
   def check_mandatory_and_visible_champs
-    champs_for_revision(scope: :public)
+    champ_errors = champs_for_revision(scope: :public)
       .filter { _1.child? ? _1.parent.visible? : true }
       .filter(&:visible?)
       .filter(&:mandatory_blank?)
       .map do |champ|
         champ.errors.add(:value, :missing)
       end
+    champ_errors.each { errors.import(_1) }
+  end
+
+  def check_in_eligibilite_rules_and_visible_champs
+    ineligible_errors = champs_for_revision(scope: :public)
+      .filter { _1.child? ? _1.parent.visible? : true }
+      .filter(&:visible?)
+      .filter(&:in_eligibilite_rules?)
+      .map do |champ|
+        champ.errors.add(:value, :needed_for_eligibilite)
+      end
+    ineligible_errors.each { errors.import(_1) }
   end
 
   def eligibilite_rules_computable?
diff --git a/app/views/shared/dossiers/_edit.html.haml b/app/views/shared/dossiers/_edit.html.haml
index 534a73f07dd..65ee42348bc 100644
--- a/app/views/shared/dossiers/_edit.html.haml
+++ b/app/views/shared/dossiers/_edit.html.haml
@@ -10,7 +10,7 @@
   = render NestedForms::FormOwnerComponent.new
   = form_for dossier_for_editing, url: brouillon_dossier_url(dossier), method: :patch, html: { id: 'dossier-edit-form', class: 'form', multipart: true, novalidate: 'novalidate' } do |f|
 
-    = render Dossiers::ErrorsFullMessagesComponent.new(dossier: @dossier, errors: @errors || [])
+    = render Dossiers::ErrorsFullMessagesComponent.new(dossier: dossier)
     %header.mb-6
       .fr-highlight
         %p.fr-text--sm
diff --git a/config/locales/models/champs/champs.en.yml b/config/locales/models/champs/champs.en.yml
index ead7030628d..02b79cf9b79 100644
--- a/config/locales/models/champs/champs.en.yml
+++ b/config/locales/models/champs/champs.en.yml
@@ -7,4 +7,4 @@ fr:
             value:
               format: '%{message}'
               missing: must be filled
-
+              needed_for_eligibilite: must be filled in order to know if your file is elegible
diff --git a/config/locales/models/champs/champs.fr.yml b/config/locales/models/champs/champs.fr.yml
index 090aabf5549..85849e719a5 100644
--- a/config/locales/models/champs/champs.fr.yml
+++ b/config/locales/models/champs/champs.fr.yml
@@ -7,4 +7,4 @@ fr:
             value:
               format: '%{message}'
               missing: doit être rempli
-
+              needed_for_eligibilite: doît être rempli pour determiner si votre dossier est éligible
diff --git a/spec/controllers/users/dossiers_controller_spec.rb b/spec/controllers/users/dossiers_controller_spec.rb
index 89cb459f341..5c010ff8d1d 100644
--- a/spec/controllers/users/dossiers_controller_spec.rb
+++ b/spec/controllers/users/dossiers_controller_spec.rb
@@ -397,7 +397,9 @@
 
   describe '#submit_brouillon' do
     before { sign_in(user) }
-    let!(:dossier) { create(:dossier, user: user) }
+    let(:procedure) { create(:procedure, :published, types_de_champ_public:) }
+    let(:types_de_champ_public) { [{ type: :text }] }
+    let!(:dossier) { create(:dossier, user:, procedure:) }
     let(:first_champ) { dossier.champs_public.first }
     let(:anchor_to_first_champ) { controller.helpers.link_to first_champ.libelle, brouillon_dossier_path(anchor: first_champ.labelledby_id), class: 'error-anchor' }
     let(:value) { 'beautiful value' }
@@ -438,9 +440,9 @@
       render_views
       let(:error_message) { 'nop' }
       before do
-        expect_any_instance_of(Dossier).to receive(:validate).and_return(false)
-        expect_any_instance_of(Dossier).to receive(:errors).and_return(
-          [double(inner_error: double(base: first_champ), message: 'nop')]
+        allow_any_instance_of(Dossier).to receive(:validate).and_return(false)
+        allow_any_instance_of(Dossier).to receive(:errors).and_return(
+          [instance_double(ActiveModel::NestedError, inner_error: double(base: first_champ), message: 'nop')]
         )
         subject
       end
@@ -460,15 +462,38 @@
       render_views
 
       let(:value) { nil }
+      let(:types_de_champ_public) { [{ type: :text, mandatory: true, libelle: 'l' }] }
+      before { subject }
+
+      it { expect(response).to render_template(:brouillon) }
+      it { expect(response.body).to have_link(first_champ.libelle, href: "##{first_champ.labelledby_id}") }
+      it { expect(response.body).to have_content("doit être rempli") }
+    end
+
+    context 'when a eligible champ is missing' do
+      include Logic
+      render_views
+
+      let(:value) { nil }
+      let(:types_de_champ_public) { [{ type: :yes_no, libelle: 'l1' }, { type: :integer_number, libelle: 'l2' }] }
+      let(:yes_no_tdc) { dossier.champs_public.first }
+      let(:integer_tdc) { dossier.champs_public.last }
+
+      let(:initial_condition) do
+        ds_or([
+          ds_eq(champ_value(yes_no_tdc.stable_id), constant(true)),
+          ds_eq(champ_value(integer_tdc.stable_id), constant(1))
+        ])
+      end
 
       before do
-        first_champ.type_de_champ.update(mandatory: true, libelle: 'l')
+        procedure.published_revision.update(eligibilite_enabled: true, eligibilite_rules: initial_condition, eligibilite_message: :ko)
         subject
       end
 
       it { expect(response).to render_template(:brouillon) }
       it { expect(response.body).to have_link(first_champ.libelle, href: "##{first_champ.labelledby_id}") }
-      it { expect(response.body).to have_content("doit être rempli") }
+      it { expect(response.body).to have_content("doît être rempli pour determiner si votre dossier est éligible") }
     end
 
     context 'when dossier has no champ' do
@@ -547,8 +572,8 @@
       render_views
 
       before do
-        expect_any_instance_of(Dossier).to receive(:validate).and_return(false)
-        expect_any_instance_of(Dossier).to receive(:errors).and_return(
+        allow_any_instance_of(Dossier).to receive(:validate).and_return(false)
+        allow_any_instance_of(Dossier).to receive(:errors).and_return(
           [double(inner_error: double(base: first_champ), message: 'nop')]
         )
 
@@ -569,6 +594,32 @@
       it { expect(response.body).to have_link(first_champ.libelle, href: "##{first_champ.labelledby_id}") }
     end
 
+    context 'when a eligible champ is missing' do
+      include Logic
+      render_views
+
+      let(:value) { nil }
+      let(:types_de_champ_public) { [{ type: :yes_no, libelle: 'l1' }, { type: :integer_number, libelle: 'l2' }] }
+      let(:yes_no_tdc) { dossier.champs_public.first }
+      let(:integer_tdc) { dossier.champs_public.last }
+
+      let(:initial_condition) do
+        ds_or([
+          ds_eq(champ_value(yes_no_tdc.stable_id), constant(true)),
+          ds_eq(champ_value(integer_tdc.stable_id), constant(1))
+        ])
+      end
+
+      before do
+        procedure.published_revision.update(eligibilite_enabled: true, eligibilite_rules: initial_condition, eligibilite_message: :ko)
+        subject
+      end
+
+      it { expect(response).to render_template(:modifier) }
+      it { expect(response.body).to have_link(first_champ.libelle, href: "##{first_champ.labelledby_id}") }
+      it { expect(response.body).to have_content("doît être rempli pour determiner si votre dossier est éligible") }
+    end
+
     context 'when dossier has no champ' do
       let(:submit_payload) { { id: dossier.id } }
 
@@ -810,7 +861,11 @@
       let(:must_be_greater_than) { 10 }
 
       before do
-        procedure.published_revision.eligibilite_rules = greater_than(champ_value(number_champ.stable_id), constant(must_be_greater_than))
+        procedure.published_revision.update(
+          eligibilite_enabled: true,
+          eligibilite_message: 'lol',
+          eligibilite_rules: greater_than(champ_value(number_champ.stable_id), constant(must_be_greater_than))
+        )
         procedure.published_revision.save!
       end
       render_views
@@ -947,8 +1002,8 @@
 
       context 'classic error' do
         before do
-          expect_any_instance_of(Dossier).to receive(:save).and_return(false)
-          expect_any_instance_of(Dossier).to receive(:errors).and_return(
+          allow_any_instance_of(Dossier).to receive(:save).and_return(false)
+          allow_any_instance_of(Dossier).to receive(:errors).and_return(
             [message: 'nop', inner_error: double(base: first_champ)]
           )
           subject