diff --git a/app/models/modules.py b/app/models/modules.py
index d4c70c038..c0bb84ac7 100644
--- a/app/models/modules.py
+++ b/app/models/modules.py
@@ -6,6 +6,7 @@ from app.models import APO_CODE_STR_LEN
 from app.models.but_refcomp import ApcParcours, app_critiques_modules, parcours_modules
 from app.scodoc import sco_utils as scu
 from app.scodoc.sco_codes_parcours import UE_SPORT
+from app.scodoc.sco_exceptions import ScoValueError
 from app.scodoc.sco_utils import ModuleType
 
 
@@ -175,6 +176,8 @@ class Module(db.Model):
         ue_coef_dict = { ue_id : coef }
         Les coefs nuls (zéro) ne sont pas stockés: la relation est supprimée.
         """
+        if self.formation.has_locked_sems():
+            raise ScoValueError("Formation verrouillée")
         changed = False
         for ue_id, coef in ue_coef_dict.items():
             # Existant ?
@@ -201,6 +204,8 @@ class Module(db.Model):
 
     def update_ue_coef_dict(self, ue_coef_dict: dict):
         """update coefs vers UE (ajoute aux existants)"""
+        if self.formation.has_locked_sems():
+            raise ScoValueError("Formation verrouillée")
         current = self.get_ue_coef_dict()
         current.update(ue_coef_dict)
         self.set_ue_coef_dict(current)
@@ -211,6 +216,8 @@ class Module(db.Model):
 
     def delete_ue_coef(self, ue):
         """delete coef"""
+        if self.formation.has_locked_sems():
+            raise ScoValueError("Formation verrouillée")
         ue_coef = ModuleUECoef.query.get((self.id, ue.id))
         if ue_coef:
             db.session.delete(ue_coef)
diff --git a/app/scodoc/sco_edit_ue.py b/app/scodoc/sco_edit_ue.py
index 30a84a008..2ea467c2a 100644
--- a/app/scodoc/sco_edit_ue.py
+++ b/app/scodoc/sco_edit_ue.py
@@ -47,7 +47,6 @@ from app.models import (
 )
 from app.models import ApcValidationRCUE, ScolarFormSemestreValidation, ScolarEvent
 from app.models import ScolarNews
-from app.models.formations import Matiere
 import app.scodoc.notesdb as ndb
 import app.scodoc.sco_utils as scu
 from app.scodoc.sco_utils import ModuleType
@@ -64,7 +63,6 @@ from app.scodoc import sco_codes_parcours
 from app.scodoc import sco_edit_apc
 from app.scodoc import sco_edit_matiere
 from app.scodoc import sco_edit_module
-from app.scodoc import sco_formsemestre
 from app.scodoc import sco_groups
 from app.scodoc import sco_moduleimpl
 from app.scodoc import sco_tag_module
@@ -815,7 +813,7 @@ du programme" (menu "Semestre") si vous avez un semestre en cours);
         <li> <a class="stdlink" href="{
             url_for('notes.edit_modules_ue_coefs', 
                 scodoc_dept=g.scodoc_dept, formation_id=formation_id, semestre_idx=semestre_idx)
-        }">Éditer les coefficients des ressources et SAÉs</a>
+        }">{'Visualiser' if locked else 'Éditer'} les coefficients des ressources et SAÉs</a>
         </li>
         </ul>
         """
diff --git a/app/views/pn_modules.py b/app/views/pn_modules.py
index 6868b8bd5..e12c07f48 100644
--- a/app/views/pn_modules.py
+++ b/app/views/pn_modules.py
@@ -165,7 +165,7 @@ def set_module_ue_coef():
         coef = float(request.form["coef"].replace(",", "."))
     except ValueError:
         return scu.json_error(404, "invalid coef")
-    module = models.Module.query.get(module_id)
+    module: Module = models.Module.query.get(module_id)
     if module is None:
         return scu.json_error(404, f"module not found ({module_id})")
     ue = models.UniteEns.query.get(ue_id)
@@ -229,7 +229,8 @@ def edit_modules_ue_coefs():
                 "notes.set_module_ue_coef",
                 scodoc_dept=g.scodoc_dept,
             ),
-            read_only=not current_user.has_permission(Permission.ScoChangeFormation),
+            read_only=locked
+            or not current_user.has_permission(Permission.ScoChangeFormation),
             semestre_idx=semestre_idx,
             semestre_ids=range(1, formation.get_parcours().NB_SEM + 1),
             parcours_id=parcours_id,