diff --git a/src/agenda_culturel/models.py b/src/agenda_culturel/models.py
index 0cab685..770e073 100644
--- a/src/agenda_culturel/models.py
+++ b/src/agenda_culturel/models.py
@@ -1184,10 +1184,10 @@ class Event(models.Model):
             events.sort(key=lambda e: e.imported_date, reverse=True)
             return events[0]
 
-    def update(self, other):
+    def update(self, other, all):
         
         # set attributes
-        for attr in Event.data_fields():
+        for attr in Event.data_fields(all=all):
             setattr(self, attr, getattr(other, attr))
 
         # adjust modified date if required
@@ -1236,12 +1236,13 @@ class Event(models.Model):
             if len(same_events) != 0:
                 # check if one event has been imported and not modified in this list
                 same_imported = Event.find_last_pure_import(same_events)
-
+                pure = True
                 # if not, we check if it does not match exactly with another
                 if not same_imported:
                     for e in same_events:
                         if event.similar(e, False):
                             same_imported = e
+                            pure = False
                             break
 
                 if same_imported:
@@ -1253,7 +1254,7 @@ class Event(models.Model):
                                     same_imported.other_versions.representative = None
                                     same_imported.other_versions.save()
 
-                    same_imported.update(event)
+                    same_imported.update(event, pure) # we only update all tags if it"s a pure import
                     same_imported.set_in_importation_process()
                     same_imported.prepare_save()
                     to_update.append(same_imported)