diff --git a/app/components/types_de_champ_editor/conditions_errors_component.rb b/app/components/types_de_champ_editor/conditions_errors_component.rb
index 4964d827f..d3500ab75 100644
--- a/app/components/types_de_champ_editor/conditions_errors_component.rb
+++ b/app/components/types_de_champ_editor/conditions_errors_component.rb
@@ -56,6 +56,10 @@ class TypesDeChampEditor::ConditionsErrorsComponent < ApplicationComponent
         right: right.to_s.downcase)
     in { type: :required_list }
       t('required_list', scope: '.errors')
+    in { type: :required_include, operator_name: "Logic::Eq" }
+      t("required_include.eq", scope: '.errors')
+    in { type: :required_include, operator_name: "Logic::NotEq" }
+      t("required_include.not_eq", scope: '.errors')
     else
       nil
     end
diff --git a/app/components/types_de_champ_editor/conditions_errors_component/conditions_errors_component.en.yml b/app/components/types_de_champ_editor/conditions_errors_component/conditions_errors_component.en.yml
index 5cdbcd70e..b80127786 100644
--- a/app/components/types_de_champ_editor/conditions_errors_component/conditions_errors_component.en.yml
+++ b/app/components/types_de_champ_editor/conditions_errors_component/conditions_errors_component.en.yml
@@ -1,9 +1,12 @@
 ---
-fr:
+en:
   errors:
     not_available: "A targeted field is not available."
     unmanaged: "The field « %{libelle} » is a « %{type_champ} » and cannot be used as conditional source."
     incompatible: "The field « %{libelle} » is a « %{type_champ} ». It cannot be %{operator} « %{right} »."
     required_number: "« %{operator} » applies only to number."
     required_list: "The « include » operator only applies to simple or multiple choice."
+    required_include:
+      eq: "The « is » operator does not apply to multiple dropdown list. Select the « includes » operator."
+      not_eq: "The « is not » operator does not apply to multiple dropdown list."
     not_included: "« %{right} » is not included in « %{libelle} »."
diff --git a/app/components/types_de_champ_editor/conditions_errors_component/conditions_errors_component.fr.yml b/app/components/types_de_champ_editor/conditions_errors_component/conditions_errors_component.fr.yml
index 5be0ad01c..7062b6f93 100644
--- a/app/components/types_de_champ_editor/conditions_errors_component/conditions_errors_component.fr.yml
+++ b/app/components/types_de_champ_editor/conditions_errors_component/conditions_errors_component.fr.yml
@@ -6,4 +6,7 @@ fr:
     incompatible: "Le champ « %{libelle} » est de type « %{type_champ} ». Il ne peut pas être %{operator} « %{right} »."
     required_number: "« %{operator} » ne s'applique qu'à des nombres."
     required_list: "Lʼopérateur « inclus » ne s'applique qu'au choix simple ou multiple."
+    required_include:
+      eq: "Lʼopérateur « est » ne s'applique pas au choix multiple. Sélectionnez l’opérateur « contient »."
+      not_eq: "Lʼopérateur « n’est pas » ne s'applique pas au choix multiple."
     not_included: "« %{right} » ne fait pas partie de « %{libelle} »."
diff --git a/app/models/logic/eq.rb b/app/models/logic/eq.rb
index 0779be58e..da07341ce 100644
--- a/app/models/logic/eq.rb
+++ b/app/models/logic/eq.rb
@@ -20,6 +20,12 @@ class Logic::Eq < Logic::BinaryOperator
         stable_id: @left.stable_id,
         right: @right
       }
+    elsif @left.type(type_de_champs) == :enums
+      errors << {
+        type: :required_include,
+        stable_id: @left.try(:stable_id),
+        operator_name: self.class.name
+      }
     end
 
     errors + @left.errors(type_de_champs) + @right.errors(type_de_champs)
diff --git a/spec/components/types_de_champ_editor/conditions_errors_component_spec.rb b/spec/components/types_de_champ_editor/conditions_errors_component_spec.rb
index c76e53dc5..e829bc305 100644
--- a/spec/components/types_de_champ_editor/conditions_errors_component_spec.rb
+++ b/spec/components/types_de_champ_editor/conditions_errors_component_spec.rb
@@ -72,6 +72,22 @@ describe TypesDeChampEditor::ConditionsErrorsComponent, type: :component do
       it { expect(page).to have_content("« another choice » ne fait pas partie de « #{tdc.libelle} ».") }
     end
 
+    context 'when an eq operator applies to a multiple_drop_down' do
+      let(:tdc) { create(:type_de_champ_multiple_drop_down_list) }
+      let(:upper_tdcs) { [tdc] }
+      let(:conditions) { [ds_eq(champ_value(tdc.stable_id), constant(tdc.drop_down_list_enabled_non_empty_options.first))] }
+
+      it { expect(page).to have_content("« est » ne s'applique pas au choix multiple.") }
+    end
+
+    context 'when an not_eq operator applies to a multiple_drop_down' do
+      let(:tdc) { create(:type_de_champ_multiple_drop_down_list) }
+      let(:upper_tdcs) { [tdc] }
+      let(:conditions) { [ds_not_eq(champ_value(tdc.stable_id), constant(tdc.drop_down_list_enabled_non_empty_options.first))] }
+
+      it { expect(page).to have_content("« n’est pas » ne s'applique pas au choix multiple.") }
+    end
+
     context 'when target became unavailable but a right still references the value' do
       # Cf https://demarches-simplifiees.sentry.io/issues/3625488398/events/53164e105bc94d55a004d69f96d58fb2/?project=1429550
       # However maybe we should not have empty at left with still a constant at right
diff --git a/spec/models/logic/eq_spec.rb b/spec/models/logic/eq_spec.rb
index fb9a9dee7..85464104b 100644
--- a/spec/models/logic/eq_spec.rb
+++ b/spec/models/logic/eq_spec.rb
@@ -17,6 +17,19 @@ describe Logic::Eq do
       }
       expect(ds_eq(constant(true), constant(1)).errors).to eq([expected])
     end
+
+    it do
+      multiple_drop_down = create(:type_de_champ_multiple_drop_down_list)
+      first_option = multiple_drop_down.drop_down_list_enabled_non_empty_options.first
+
+      expected = {
+        operator_name: "Logic::Eq",
+        stable_id: multiple_drop_down.stable_id,
+        type: :required_include
+      }
+
+      expect(ds_eq(champ_value(multiple_drop_down.stable_id), constant(first_option)).errors([multiple_drop_down])).to eq([expected])
+    end
   end
 
   describe '#==' do
diff --git a/spec/models/logic/not_eq_spec.rb b/spec/models/logic/not_eq_spec.rb
index b119e75f5..9125a62a2 100644
--- a/spec/models/logic/not_eq_spec.rb
+++ b/spec/models/logic/not_eq_spec.rb
@@ -17,6 +17,19 @@ describe Logic::NotEq do
       }
       expect(ds_not_eq(constant(true), constant(1)).errors).to eq([expected])
     end
+
+    it do
+      multiple_drop_down = create(:type_de_champ_multiple_drop_down_list)
+      first_option = multiple_drop_down.drop_down_list_enabled_non_empty_options.first
+
+      expected = {
+        operator_name: "Logic::NotEq",
+        stable_id: multiple_drop_down.stable_id,
+        type: :required_include
+      }
+
+      expect(ds_not_eq(champ_value(multiple_drop_down.stable_id), constant(first_option)).errors([multiple_drop_down])).to eq([expected])
+    end
   end
 
   describe '#==' do