diff --git a/la_chariotte/order/migrations/0025_groupedorder_code.py b/la_chariotte/order/migrations/0025_groupedorder_code.py
index d8f72ca..f67a2c4 100644
--- a/la_chariotte/order/migrations/0025_groupedorder_code.py
+++ b/la_chariotte/order/migrations/0025_groupedorder_code.py
@@ -23,7 +23,14 @@ def set_code_default(apps, schema_editor):
     for grouped_order in GroupedOrder.objects.all().iterator():
         grouped_order.code = create_code_from_pk(grouped_order.pk)
         grouped_order.save()
-        
+
+def reverse_set_code_default(apps, schema_editor):
+    """Reverse the set_code default function"""
+    GroupedOrder = apps.get_model("order","GroupedOrder")
+    for grouped_order in GroupedOrder.objects.all().iterator():
+        grouped_order.code = ''
+        grouped_order.save()
+            
 
 class Migration(migrations.Migration):
     dependencies = [
@@ -36,7 +43,7 @@ class Migration(migrations.Migration):
             name="code",
             field=models.CharField(auto_created=True, null=True),
         ),
-        migrations.RunPython(set_code_default),
+        migrations.RunPython(set_code_default, reverse_set_code_default),
         migrations.AlterField(
             model_name="groupedorder",
             name="code",