diff --git a/app/models/formsemestre.py b/app/models/formsemestre.py
index 24468c7fb..680e3ff98 100644
--- a/app/models/formsemestre.py
+++ b/app/models/formsemestre.py
@@ -317,7 +317,7 @@ class FormSemestre(db.Model):
                     }
                 )
             ues = sem_ues.values()
-            return sorted(ues, key=attrgetter("numero"))
+            return sorted(ues, key=attrgetter("numero", "acronyme"))
         else:
             sem_ues = db.session.query(UniteEns).filter(
                 ModuleImpl.formsemestre_id == self.id,
diff --git a/app/models/modules.py b/app/models/modules.py
index ed155fdd2..cfc6a994f 100644
--- a/app/models/modules.py
+++ b/app/models/modules.py
@@ -1,5 +1,6 @@
 """ScoDoc 9 models : Modules
 """
+from operator import attrgetter
 from flask import current_app
 
 from app import db
@@ -229,7 +230,7 @@ class Module(db.Model):
         """delete coef"""
         if self.formation.has_locked_sems(self.ue.semestre_idx):
             current_app.logguer.info(
-                f"delete_ue_coef: locked formation, ignoring request"
+                "delete_ue_coef: locked formation, ignoring request"
             )
             raise ScoValueError("Formation verrouillée")
         ue_coef = ModuleUECoef.query.get((self.id, ue.id))
@@ -238,10 +239,10 @@ class Module(db.Model):
             self.formation.invalidate_module_coefs()
 
     def get_ue_coefs_sorted(self):
-        "les coefs d'UE, trié par numéro d'UE"
+        "les coefs d'UE, trié par numéro et acronyme d'UE"
         # je n'ai pas su mettre un order_by sur le backref sans avoir
         # à redéfinir les relationships...
-        return sorted(self.ue_coefs, key=lambda x: x.ue.numero)
+        return sorted(self.ue_coefs, key=attrgetter("numero", "acronyme"))
 
     def ue_coefs_list(
         self, include_zeros=True, ues: list["UniteEns"] = None
diff --git a/app/scodoc/sco_edit_ue.py b/app/scodoc/sco_edit_ue.py
index cd286f895..f41804f13 100644
--- a/app/scodoc/sco_edit_ue.py
+++ b/app/scodoc/sco_edit_ue.py
@@ -443,6 +443,7 @@ def ue_edit(ue_id=None, create=False, formation_id=None, default_semestre_idx=No
             {
                 "input_type": "boolcheckbox",
                 "title": "UE externe",
+                "readonly": not create,  # ne permet pas de transformer une UE existante en externe
                 "explanation": "réservé pour les capitalisations d'UE effectuées à l'extérieur de l'établissement",
             },
         ),
diff --git a/app/scodoc/sco_formations.py b/app/scodoc/sco_formations.py
index cf0239b90..981908c97 100644
--- a/app/scodoc/sco_formations.py
+++ b/app/scodoc/sco_formations.py
@@ -626,7 +626,9 @@ def formation_list_table() -> GenTable:
 def formation_create_new_version(formation_id, redirect=True):
     "duplicate formation, with new version number"
     formation = Formation.query.get_or_404(formation_id)
-    resp = formation_export(formation_id, export_ids=True, format="xml")
+    resp = formation_export(
+        formation_id, export_ids=True, export_external_ues=True, format="xml"
+    )
     xml_data = resp.get_data(as_text=True)
     new_id, modules_old2new, ues_old2new = formation_import_xml(
         xml_data, use_local_refcomp=True