diff --git a/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/dataaccess/db/SampleDAO.java b/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/dataaccess/db/SampleDAO.java
index b897b9a6b6a1048a31e0f40605f52871129edd76..9579800e6c6429c36554ddbd6f7dac28cf4d064c 100644
--- a/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/dataaccess/db/SampleDAO.java
+++ b/openbis/source/java/ch/systemsx/cisd/openbis/generic/server/dataaccess/db/SampleDAO.java
@@ -88,7 +88,7 @@ public class SampleDAO extends AbstractGenericEntityWithPropertiesDAO<SamplePE>
         }
         lockEntity(sample.getExperiment());
         lockEntity(sample.getContainer());
-        lockEntities(sample.getParents());
+        // lockEntities(sample.getParents());
         hibernateTemplate.saveOrUpdate(sample);
         if (doLog && operationLog.isInfoEnabled())
         {