diff --git a/product/ERP5/Document/BusinessTemplate.py b/product/ERP5/Document/BusinessTemplate.py
index 439b40479c3386114f27b0ca61f61f5f53bdfe40..7db01216627a31f1207f3beb18773d2f30cf3f6b 100644
--- a/product/ERP5/Document/BusinessTemplate.py
+++ b/product/ERP5/Document/BusinessTemplate.py
@@ -3747,6 +3747,12 @@ Business Template is a set of definitions, such as skins, portal types and categ
           self.workflow_history[
                             'business_template_installation_workflow'] = None
 
+    def getRevision(self):
+      """returns the revision property.
+      This is a workaround for #461.
+      """
+      return self._baseGetRevision()
+
     def updateRevisionNumber(self):
         """Increment bt revision number.
         """