diff --git a/product/ERP5/mixin/base_convertable_and_file.py b/product/ERP5/mixin/base_convertable_and_file.py
index 73358f0bf997f79a74b6843bc0c5095e3ce1eea9..765747986ca9c8a7657822718062ef82231edf0a 100644
--- a/product/ERP5/mixin/base_convertable_and_file.py
+++ b/product/ERP5/mixin/base_convertable_and_file.py
@@ -56,5 +56,4 @@ class BaseConvertableAndFileMixin:
     if not isinstance(data, Pdata) and data is not None:
       file = cStringIO.StringIO(data)
       data, size = self._read_data(file)
-      self._setSize(size)
     self._baseSetBaseData(data)