diff --git a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeColumnTypePanel.java b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeColumnTypePanel.java
index e26184c..800df9a 100644
--- a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeColumnTypePanel.java
+++ b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeColumnTypePanel.java
@@ -784,7 +784,8 @@ public class ChangeColumnTypePanel extends FramedPanel implements
 			comboColumnReferenceTypeLabel.setVisible(false);
 			comboColumnMappingLabel.setVisible(false);
 			comboPeriodTypeLabel.setVisible(false);
-			comboValueDataFormatLabel.setVisible(true);
+			comboValueDataFormatLabel.setVisible(false);
+			comboAttributeType.reset();
 			break;
 		case DIMENSION:
 			comboLocaleTypeLabel.setVisible(false);
@@ -804,7 +805,7 @@ public class ChangeColumnTypePanel extends FramedPanel implements
 			comboColumnReferenceTypeLabel.setVisible(false);
 			comboColumnMappingLabel.setVisible(false);
 			comboPeriodTypeLabel.setVisible(false);
-			comboValueDataFormatLabel.setVisible(true);
+			comboValueDataFormatLabel.setVisible(false);
 			break;
 		case TIMEDIMENSION:
 			comboLocaleTypeLabel.setVisible(false);
@@ -836,6 +837,7 @@ public class ChangeColumnTypePanel extends FramedPanel implements
 	}
 
 	protected void updateMeasureType(ColumnDataType type) {
+		comboValueDataFormatLabel.setVisible(true);
 		ArrayList<ValueDataFormat> valueDataFormats = valueDataFormatMap
 				.get(type);
 		comboValueDataFormat.clear();
@@ -965,6 +967,7 @@ public class ChangeColumnTypePanel extends FramedPanel implements
 					.selectedMeasure(cd.getDataTypeName()));
 			comboMeasureType.setValue(ColumnDataTypeStore
 					.selectedMeasureElement(cd.getDataTypeName()));
+			comboValueDataFormatLabel.setVisible(true);
 			ColumnDataType columnDataType = ColumnDataType
 					.getColumnDataTypeFromId(cd.getDataTypeName());
 			ArrayList<ValueDataFormat> valueDataFormats = valueDataFormatMap
@@ -1231,7 +1234,9 @@ public class ChangeColumnTypePanel extends FramedPanel implements
 									.setColumnDataTypeTarget(dataType);
 							ValueDataFormat valueDataFormat = comboValueDataFormat
 									.getCurrentValue();
-							if (valueDataFormat != null) {
+							if (valueDataFormat != null
+									|| (valueDataFormat == null && dataType
+											.compareTo(ColumnDataType.Text) == 0)) {
 								changeColumnTypeSession
 										.setValueDataFormat(valueDataFormat);
 								callChangeColumnType();