diff --git a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellReference.java b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellReference.java
index 0fb61047dae7e8e86690eaded2e358cd5aae8971..714332afbfc35022fb50ee5135ae11d1e9acbbd2 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellReference.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellReference.java
@@ -82,4 +82,10 @@ public class WellReference implements ISerializable
             return false;
         return true;
     }
+
+    @Override
+    public String toString()
+    {
+        return platePermId + wellLocation.toString();
+    }
 }
\ No newline at end of file
diff --git a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellSearchCriteria.java b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellSearchCriteria.java
index 21fda21124aaee14ac4023ab9b0cabd86b0fd767..92852d28bcb1c1d179b640e398a7a2cbb3b62557 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellSearchCriteria.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/shared/basic/dto/WellSearchCriteria.java
@@ -472,7 +472,6 @@ public class WellSearchCriteria implements ISerializable
         private String analysisProcedureCodeOrNull;
 
         // GWT only
-        @SuppressWarnings("unused")
         private AnalysisProcedureCriteria()
         {
         }