diff --git a/product/ERP5/Document/FloatDivergenceTester.py b/product/ERP5/Document/FloatDivergenceTester.py
index 531e9397945ed111edd2daaacbd0a3e61aa255f9..608dbdfc77785de0c0051e46ce9485d1ee7ad63a 100644
--- a/product/ERP5/Document/FloatDivergenceTester.py
+++ b/product/ERP5/Document/FloatDivergenceTester.py
@@ -118,7 +118,7 @@ class FloatDivergenceTester(Predicate):
     If decision_movement is a simulation movement, use
     the recorded properties instead of the native ones.
     """
-    raise NotImplementedError
+    return '%s/%s' % (self.getPortalType(), self.getTestedProperty())
 
   def compare(self, prevision_movement, decision_movement):
     """