diff --git a/app/models.py b/app/models.py
index f288e14..39bb8c7 100644
--- a/app/models.py
+++ b/app/models.py
@@ -47,29 +47,31 @@ class Competence(db.Model):
     niveaux = db.Column(db.Text(), info={'label': 'Niveaux'})
     acs = db.relationship("AC", order_by="AC.code", secondary=ACs_Competences, lazy=False, backref=db.backref("competences", lazy=False))
 
-    def updateCoefSAE(self, saes, coef=0):
+    def updateCoefSAE(self, saes, query, coef=0):
         listeSAE = [coefsae.sae for coefsae in self.saes]
         for sae in saes:
-            if sae in listeSAE:
-                CoefSAE.query.filter_by(sae=sae, competence=self).first().coef = coef
-                listeSAE.remove(sae)
-            else: 
-                self.saes.append(CoefSAE(competence=self, sae=sae, coef=coef))
+            if sae in query:
+                if sae in listeSAE:
+                    CoefSAE.query.filter_by(sae=sae, competence=self).first().coef = coef
+                    listeSAE.remove(sae)
+                else: 
+                    self.saes.append(CoefSAE(competence=self, sae=sae, coef=coef))
         for sae in listeSAE:
             db.session.delete(CoefSAE.query.filter_by(sae=sae, competence=self).first())
-            db.session.commit()
+        db.session.commit()
 
-    def updateCoefRessource(self, ressources, coef=0):
+    def updateCoefRessource(self, ressources, query, coef=0):
         listeRessource = [coefressource.ressource for coefressource in self.ressources]
         for ressource in ressources:
-            if ressource in listeRessource:
-                CoefRessource.query.filter_by(ressource=ressource, competence=self).first().coef = coef
-                listeRessource.remove(ressource)
-            else:
-                self.ressources.append(CoefRessource(competence=self, ressource=ressource, coef=coef))
+            if ressource in query:
+                if ressource in listeRessource:
+                    CoefRessource.query.filter_by(ressource=ressource, competence=self).first().coef = coef
+                    listeRessource.remove(ressource)
+                else:
+                    self.ressources.append(CoefRessource(competence=self, ressource=ressource, coef=coef))
         for ressource in listeRessource:
             db.session.delete(CoefRessource.query.filter_by(ressource=ressource, competence=self).first())
-            db.session.commit()
+        db.session.commit()
 
     def export(self):
         result = dict(self.__dict__)
diff --git a/app/routes.py b/app/routes.py
index 8380f3c..90248f5 100644
--- a/app/routes.py
+++ b/app/routes.py
@@ -51,13 +51,21 @@ def Semestre(num):
         for i, field in enumerate(form.ueform):
             ue = models.Competence.query.filter_by(code=field.ue.data).first()
             ue.acs = field.acs.data
-            ue.updateCoefSAE(field.saes.data)
-            ue.updateCoefRessource(field.ressources.data)
+            # Fabrique la liste des Coefs qui ne doit pas être supprimé suite à un éventuel suppression d'un AC
+            querySAE = []
+            queryRessource = []
+            for ac in ue.acs:
+                for sae in ac.saes:
+                    if sae not in querySAE: querySAE.append(sae)
+                for ressource in ac.ressources:
+                    if ressource not in queryRessource: queryRessource.append(ressource)
+            ue.updateCoefSAE(field.saes.data, querySAE)
+            ue.updateCoefRessource(field.ressources.data, queryRessource)
             for coeffield in field.coef:
                 codeClass, code = coeffield.objetformation.data[1:-1].split()
                 model = getattr(models, codeClass)
                 objetformation = model.query.filter_by(code=code).first()
-                if objetformation in field.saes.data or objetformation in field.ressources.data:
+                if objetformation in querySAE or objetformation in queryRessource:
                     objetformation.setCoef(coeffield.coef.data, ue)
         db.session.commit()
         return redirect(url_for("Semestre", num=num))