diff --git a/app/models.py b/app/models.py
index 780d04f..8069b57 100644
--- a/app/models.py
+++ b/app/models.py
@@ -88,8 +88,8 @@ class CoefSAE(db.Model):
     competence_code = db.Column(db.String(32), db.ForeignKey("competence.code"), primary_key=True)
     sae_code = db.Column(db.String(32), db.ForeignKey("SAE.code"), primary_key=True)
     coef = db.Column(db.String(2))
-    competence = db.relationship("Competence", lazy=False, backref=db.backref("saes"))
-    sae = db.relationship("SAE", lazy=False, backref=db.backref("competences"))
+    competence = db.relationship("Competence", lazy=False, backref=db.backref("saes", cascade="save-update, merge, delete, delete-orphan"))
+    sae = db.relationship("SAE", lazy=False, backref=db.backref("competences", cascade="save-update, merge, delete, delete-orphan"))
 
     def export(self):
         result = dict(self.__dict__)
@@ -100,8 +100,8 @@ class CoefRessource(db.Model):
     competence_code = db.Column(db.String(32), db.ForeignKey("competence.code"), primary_key=True)
     ressource_code = db.Column(db.String(32), db.ForeignKey("ressource.code"), primary_key=True)
     coef = db.Column(db.String(2))
-    competence = db.relationship("Competence", lazy=False, backref=db.backref("ressources"))
-    ressource = db.relationship("Ressource", lazy=False, backref=db.backref("competences"))
+    competence = db.relationship("Competence", lazy=False, backref=db.backref("ressources", cascade="save-update, merge, delete, delete-orphan"))
+    ressource = db.relationship("Ressource", lazy=False, backref=db.backref("competences", cascade="save-update, merge, delete, delete-orphan"))
 
     def export(self):
         result = dict(self.__dict__)
diff --git a/app/routes.py b/app/routes.py
index 4df68a0..0a1aeb4 100644
--- a/app/routes.py
+++ b/app/routes.py
@@ -47,9 +47,12 @@ def Semestre(num):
         form.ueform.__getitem__(i).ressources.query=queryRessource
         if not form.update.data:
             for coefsae in ue.saes:
-                form.ueform.__getitem__(i).coef.append_entry(data={"objetformation": coefsae.sae})
+                if coefsae.sae in querySAE: form.ueform.__getitem__(i).coef.append_entry(data={"objetformation": coefsae.sae})
+                else: db.session.delete(coefsae)
             for coefressource in ue.ressources:
-                form.ueform.__getitem__(i).coef.append_entry(data={"objetformation": coefressource.ressource})
+                if coefressource.ressource in queryRessource: form.ueform.__getitem__(i).coef.append_entry(data={"objetformation": coefressource.ressource})
+                else: db.session.delete(coefressource)
+        db.session.commit()
     # Appuie sur Update
     if form.update.data:   
         semestre.ues = [ue for ue in form.ues.data] 
@@ -57,7 +60,7 @@ 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
-            # Fabrique la liste des Coefs qui ne doit pas être supprimé suite à un éventuel suppression d'un AC
+            # Fabrique la liste des Coefs qui ne doit pas être supprimé suite à un éventuel désélection d'un AC
             querySAE = []
             queryRessource = []
             for ac in ue.acs: