diff --git a/app/models/formsemestre.py b/app/models/formsemestre.py
index 983448c0f..89468ab2f 100644
--- a/app/models/formsemestre.py
+++ b/app/models/formsemestre.py
@@ -41,6 +41,10 @@ class FormSemestre(db.Model):
     bul_hide_xml = db.Column(
         db.Boolean(), nullable=False, default=False, server_default="false"
     )
+    # Bloque le calcul des moyennes (générale et d'UE)
+    block_moyennes = db.Column(
+        db.Boolean(), nullable=False, default=False, server_default="false"
+    )
     # semestres decales (pour gestion jurys):
     gestion_semestrielle = db.Column(
         db.Boolean(), nullable=False, default=False, server_default="false"
diff --git a/app/scodoc/notes_table.py b/app/scodoc/notes_table.py
index aeb7dabf7..bd88cadfb 100644
--- a/app/scodoc/notes_table.py
+++ b/app/scodoc/notes_table.py
@@ -186,6 +186,8 @@ class NotesTable(object):
         self.use_ue_coefs = sco_preferences.get_preference(
             "use_ue_coefs", formsemestre_id
         )
+        # si vrai, bloque calcul des moy gen. et d'UE.:
+        self.block_moyennes = self.sem["block_moyennes"]
         # Infos sur les etudiants
         self.inscrlist = sco_formsemestre_inscriptions.do_formsemestre_inscription_list(
             args={"formsemestre_id": formsemestre_id}
@@ -738,6 +740,7 @@ class NotesTable(object):
         block_computation = (
             self.inscrdict[etudid]["etat"] == "D"
             or self.inscrdict[etudid]["etat"] == DEF
+            or self.block_moyennes
         )
 
         moy_ues = {}
diff --git a/app/scodoc/sco_formsemestre.py b/app/scodoc/sco_formsemestre.py
index 65d5d1dd0..f519a4aed 100644
--- a/app/scodoc/sco_formsemestre.py
+++ b/app/scodoc/sco_formsemestre.py
@@ -61,6 +61,7 @@ _formsemestreEditor = ndb.EditableTable(
         "gestion_semestrielle",
         "etat",
         "bul_hide_xml",
+        "block_moyennes",
         "bul_bgcolor",
         "modalite",
         "resp_can_edit",
@@ -81,6 +82,7 @@ _formsemestreEditor = ndb.EditableTable(
         "etat": bool,
         "gestion_compensation": bool,
         "bul_hide_xml": bool,
+        "block_moyennes": bool,
         "gestion_semestrielle": bool,
         "gestion_compensation": bool,
         "gestion_semestrielle": bool,
diff --git a/app/scodoc/sco_formsemestre_edit.py b/app/scodoc/sco_formsemestre_edit.py
index c1374b101..57740a0f3 100644
--- a/app/scodoc/sco_formsemestre_edit.py
+++ b/app/scodoc/sco_formsemestre_edit.py
@@ -501,6 +501,14 @@ def do_formsemestre_createwithmodules(REQUEST=None, edit=False):
                 "labels": [""],
             },
         ),
+        (
+            "block_moyennes",
+            {
+                "input_type": "boolcheckbox",
+                "title": "Bloquer moyennes",
+                "explanation": "empêcher le calcul des moyennes d'UE et générale.",
+            },
+        ),
         (
             "sep",
             {
@@ -693,7 +701,6 @@ def do_formsemestre_createwithmodules(REQUEST=None, edit=False):
             tf[2]["bul_hide_xml"] = False
         else:
             tf[2]["bul_hide_xml"] = True
-
         # remap les identifiants de responsables:
         tf[2]["responsable_id"] = User.get_user_id_from_nomplogin(
             tf[2]["responsable_id"]
diff --git a/app/scodoc/sco_formsemestre_status.py b/app/scodoc/sco_formsemestre_status.py
index ab422e537..d54629c95 100644
--- a/app/scodoc/sco_formsemestre_status.py
+++ b/app/scodoc/sco_formsemestre_status.py
@@ -948,10 +948,13 @@ Il y a des notes en attente ! Le classement des étudiants n'a qu'une valeur ind
 </td></tr>"""
         )
     H.append("</table>")
+    sem_warning = ""
     if sem["bul_hide_xml"]:
-        H.append(
-            '<p class="fontorange"><em>Bulletins non publiés sur le portail</em></p>'
-        )
+        sem_warning += "Bulletins non publiés sur le portail. "
+    if sem["block_moyennes"]:
+        sem_warning += "Calcul des moyennes bloqué !"
+    if sem_warning:
+        H.append('<p class="fontorange"><em>' + sem_warning + "</em></p>")
     if sem["semestre_id"] >= 0 and not sco_formsemestre.sem_une_annee(sem):
         H.append(
             '<p class="fontorange"><em>Attention: ce semestre couvre plusieurs années scolaires !</em></p>'
diff --git a/app/scodoc/sco_preferences.py b/app/scodoc/sco_preferences.py
index e5a274119..779506f1f 100644
--- a/app/scodoc/sco_preferences.py
+++ b/app/scodoc/sco_preferences.py
@@ -1409,7 +1409,7 @@ class BasePreferences(object):
                 {
                     "initvalue": 1,
                     "title": "Indique si les bulletins sont publiés",
-                    "explanation": "décocher si vous n'avez pas de portal étudiant publiant les bulletins",
+                    "explanation": "décocher si vous n'avez pas de portail étudiant publiant les bulletins",
                     "input_type": "boolcheckbox",
                     "labels": ["non", "oui"],
                     "category": "bul",
diff --git a/misc/createtables.sql b/misc/createtables.sql
index e5ca1ab7b..06001b3a5 100644
--- a/misc/createtables.sql
+++ b/misc/createtables.sql
@@ -1,5 +1,5 @@
 
--- Creation des tables pour gestion notes
+-- Creation des tables pour gestion notes ScoDoc 7 (OBSOLETE !)
 -- E. Viennet, Sep 2005
 
 
diff --git a/tests/unit/sco_fake_gen.py b/tests/unit/sco_fake_gen.py
index c2df6738f..0ad1453b8 100644
--- a/tests/unit/sco_fake_gen.py
+++ b/tests/unit/sco_fake_gen.py
@@ -219,6 +219,7 @@ class ScoFake(object):
         etat=None,
         gestion_compensation=None,
         bul_hide_xml=None,
+        block_moyennes=None,
         gestion_semestrielle=None,
         bul_bgcolor=None,
         modalite=NotesFormModalite.DEFAULT_MODALITE,