diff --git a/product/ERP5/Document/BudgetCell.py b/product/ERP5/Document/BudgetCell.py
index 0c68ae4d1523b26ca4554f44a0b0297841b818bd..53d75bbe1084627a7def2d566c8995c44578c782 100644
--- a/product/ERP5/Document/BudgetCell.py
+++ b/product/ERP5/Document/BudgetCell.py
@@ -132,3 +132,8 @@ class BudgetCell(Predicate, MetaNode, Movement):
               "Did not find engaged budget script for portal type: %r" % \
               self.getPortalType()
 
+    security.declareProtected(Permissions.AccessContentsInformation,
+                              'getExplanationValue')
+    def getExplanationValue(self, default=None):
+      """Explanation has no meaning for a budget cell"""
+      return default