diff --git a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/create/AddColumnPanel.java b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/create/AddColumnPanel.java
index e42ce64..325a9ce 100644
--- a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/create/AddColumnPanel.java
+++ b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/create/AddColumnPanel.java
@@ -472,10 +472,10 @@ public class AddColumnPanel extends FramedPanel implements
 							} else {
 								defaultValueString.setValue(exWrapper
 										.getReplaceExpressionContainer()
-										.getReadableExpression());
+										.getExp().getReadableExpression());
 								defaultValueString.setToolTip(exWrapper
 										.getReplaceExpressionContainer()
-										.getReadableExpression());
+										.getExp().getReadableExpression());
 							}
 							btnAddExpression.setVisible(false);
 							btnRemoveExpression.setVisible(true);