diff --git a/modules/stock/period.py b/modules/stock/period.py
index 66d0f24b5e..1ef8c6d3d0 100644
--- a/modules/stock/period.py
+++ b/modules/stock/period.py
@@ -77,6 +77,12 @@ class Period(Workflow, ModelSQL, ModelView):
     def get_rec_name(self, name):
         return Pool().get('ir.lang').get().strftime(self.date)
 
+    @classmethod
+    def copy(cls, periods, default=None):
+        default = default.copy() if default is not None else {}
+        default.setdefault('caches')
+        return super().copy(periods, default=default)
+
     @classmethod
     @ModelView.button
     @Workflow.transition('draft')