diff --git a/product/ERP5/Document/CalendarPeriod.py b/product/ERP5/Document/CalendarPeriod.py
index 98168a7886f9768f114aab18eef749548de99e19..be354e9235dfa6b3b09c15cc5b0f95baad036058 100644
--- a/product/ERP5/Document/CalendarPeriod.py
+++ b/product/ERP5/Document/CalendarPeriod.py
@@ -198,18 +198,3 @@ class CalendarPeriod(Movement, Periodicity):
       else:
         next_start_date += 1
     return next_start_date
-
-  security.declareProtected(Permissions.AccessContentsInformation, 
-                            'getIntIndex')
-  def getIntIndex(self, default=None, *args, **kw):
-    """
-    Return a default value of the int index, based on the ID 
-    """
-    # XXX This method may be defined on a higher level document
-    result = self._baseGetIntIndex(*args, **kw)
-    if result in [None, '']:
-      try:
-        result = int(self.getId())
-      except ValueError:
-        result = default
-    return result