diff --git a/app/scodoc/sco_edit_formation.py b/app/scodoc/sco_edit_formation.py
index f53275843..050623ec1 100644
--- a/app/scodoc/sco_edit_formation.py
+++ b/app/scodoc/sco_edit_formation.py
@@ -307,15 +307,6 @@ def do_formation_edit(args):
     formation.force_semestre_modules_aux_ues()
 
 
-def objects_renumber(obj_list) -> None:
-    "fixe les numeros des objets de la liste pour ne pas changer son ordre"
-    log(f"objects_renumber {obj_list}")
-    for i, obj in enumerate(obj_list):
-        obj.numero = i
-        db.session.add(obj)
-    db.session.commit()
-
-
 def module_move(module_id, after=0, redirect=True):
     """Move before/after previous one (decrement/increment numero)"""
     redirect = bool(redirect)
@@ -335,7 +326,7 @@ def module_move(module_id, after=0, redirect=True):
     modules = query.order_by(Module.numero, Module.code).all()
     if len({o.numero for o in modules}) != len(modules):
         # il y a des numeros identiques !
-        objects_renumber(modules)
+        scu.objects_renumber(modules)
     if len(modules) > 1:
         idx = [m.id for m in modules].index(module.id)
         neigh = None  # object to swap with
diff --git a/app/scodoc/sco_groups.py b/app/scodoc/sco_groups.py
index f8b84fb4d..3f3f167f5 100644
--- a/app/scodoc/sco_groups.py
+++ b/app/scodoc/sco_groups.py
@@ -45,6 +45,7 @@ import flask
 from flask import g, request
 from flask import url_for, make_response
 
+from app.models import Partition
 import app.scodoc.sco_utils as scu
 import app.scodoc.notesdb as ndb
 from app import log, cache
@@ -1059,6 +1060,16 @@ def partition_move(partition_id, after=0, redirect=1):
     if after not in (0, 1):
         raise ValueError('invalid value for "after"')
     others = get_partitions_list(formsemestre_id)
+
+    objs = (
+        Partition.query.filter_by(formsemestre_id=formsemestre_id)
+        .order_by(Partition.numero, Partition.partition_name)
+        .all()
+    )
+    if len({o.numero for o in objs}) != len(objs):
+        # il y a des numeros identiques !
+        scu.objects_renumber(objs)
+
     if len(others) > 1:
         pidx = [p["partition_id"] for p in others].index(partition_id)
         # log("partition_move: after=%s pidx=%s" % (after, pidx))
diff --git a/app/scodoc/sco_utils.py b/app/scodoc/sco_utils.py
index a9f0552a8..dfb9946d8 100644
--- a/app/scodoc/sco_utils.py
+++ b/app/scodoc/sco_utils.py
@@ -990,3 +990,13 @@ def confirm_dialog(
         )
     else:
         return "\n".join(H)
+
+
+def objects_renumber(obj_list) -> None:
+    """fixe les numeros des objets d'une liste de modèles
+    pour ne pas changer son ordre"""
+    log(f"objects_renumber {obj_list}")
+    for i, obj in enumerate(obj_list):
+        obj.numero = i
+        db.session.add(obj)
+    db.session.commit()