diff --git a/app/models/modules.py b/app/models/modules.py
index e3610148..2ea75b66 100644
--- a/app/models/modules.py
+++ b/app/models/modules.py
@@ -1,5 +1,6 @@
 """ScoDoc 9 models : Modules
 """
+from flask import current_app
 
 from app import db
 from app.models import APO_CODE_STR_LEN
@@ -176,7 +177,10 @@ 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():
+        if self.formation.has_locked_sems(self.ue.semestre_idx):
+            current_app.logguer.info(
+                f"set_ue_coef_dict: locked formation, ignoring request"
+            )
             raise ScoValueError("Formation verrouillée")
         changed = False
         for ue_id, coef in ue_coef_dict.items():
@@ -204,7 +208,10 @@ 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():
+        if self.formation.has_locked_sems(self.ue.semestre_idx):
+            current_app.logguer.info(
+                f"update_ue_coef_dict: locked formation, ignoring request"
+            )
             raise ScoValueError("Formation verrouillée")
         current = self.get_ue_coef_dict()
         current.update(ue_coef_dict)
@@ -216,7 +223,10 @@ class Module(db.Model):
 
     def delete_ue_coef(self, ue):
         """delete coef"""
-        if self.formation.has_locked_sems():
+        if self.formation.has_locked_sems(self.ue.semestre_idx):
+            current_app.logguer.info(
+                f"delete_ue_coef: locked formation, ignoring request"
+            )
             raise ScoValueError("Formation verrouillée")
         ue_coef = ModuleUECoef.query.get((self.id, ue.id))
         if ue_coef:
diff --git a/sco_version.py b/sco_version.py
index 46167352..fecae1f6 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.4.56"
+SCOVERSION = "9.4.57"
 
 SCONAME = "ScoDoc"