diff --git a/app/templates/jury/jury_delete_manual.j2 b/app/templates/jury/jury_delete_manual.j2
index 413d4aee1..e00dd545e 100644
--- a/app/templates/jury/jury_delete_manual.j2
+++ b/app/templates/jury/jury_delete_manual.j2
@@ -65,10 +65,15 @@ pages de saisie de jury habituelles).
                     </div>
                 {% endif %}
                 {% if not read_only %}
-                <form class="inline-form">
-                    <button data-v_id="{{v.id}}" data-type="validation_ue" data-etudid="{{etud.id}}"
-                    >effacer validation d'UE</button>
-                </form>
+                    {% if v.formsemestre.etat %}
+                        <form class="inline-form">
+                            <button data-v_id="{{v.id}}"
+                            data-type="validation_ue" data-etudid="{{etud.id}}"
+                            >effacer validation d'UE</button>
+                        </form>
+                    {% else %}
+                        <p class="fontred">semestre verrouillé</p>
+                    {% endif %}
                 {% endif %}
                 </div>
             </details>
@@ -197,6 +202,12 @@ document.addEventListener('DOMContentLoaded', () => {
                         location.reload();
                     } else {
                         console.log(`Error: ${SCO_URL}../api/etudiant/${etudid}/jury/${validation_type}/${v_id}/delete`);
+                        if (response.status == 403) {
+                            alert("Suppression non autorisée (semestre verrouillé?)");
+                        } else {
+                            alert(`Erreur lors de la suppression (${response.status})`);
+                        }
+                        alert("Erreur lors de la suppression");
                         throw new Error('Request failed');
                     }
                 });