diff --git a/src/main/java/org/gcube/portlets/user/td/tablewidget/client/normalize/DenormalizePanel.java b/src/main/java/org/gcube/portlets/user/td/tablewidget/client/normalize/DenormalizePanel.java
index 33df951..3c134c3 100644
--- a/src/main/java/org/gcube/portlets/user/td/tablewidget/client/normalize/DenormalizePanel.java
+++ b/src/main/java/org/gcube/portlets/user/td/tablewidget/client/normalize/DenormalizePanel.java
@@ -54,6 +54,12 @@ import com.sencha.gxt.widget.core.client.form.ComboBox;
 import com.sencha.gxt.widget.core.client.form.FieldLabel;
 import com.sencha.gxt.widget.core.client.info.Info;
 
+/**
+ * 
+ * @author giancarlo
+ * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
+ *
+ */
 public class DenormalizePanel extends FramedPanel implements
 		MonitorDialogListener {
 	protected String WIDTH = "640px";
diff --git a/src/main/java/org/gcube/portlets/user/td/tablewidget/client/normalize/NormalizePanel.java b/src/main/java/org/gcube/portlets/user/td/tablewidget/client/normalize/NormalizePanel.java
index 2ec0ce3..188b23f 100644
--- a/src/main/java/org/gcube/portlets/user/td/tablewidget/client/normalize/NormalizePanel.java
+++ b/src/main/java/org/gcube/portlets/user/td/tablewidget/client/normalize/NormalizePanel.java
@@ -21,6 +21,7 @@ import org.gcube.portlets.user.td.widgetcommonevent.client.type.SessionExpiredTy
 import org.gcube.portlets.user.td.widgetcommonevent.shared.OperationResult;
 import org.gcube.portlets.user.td.widgetcommonevent.shared.TRId;
 import org.gcube.portlets.user.td.widgetcommonevent.shared.tr.column.ColumnData;
+import org.gcube.portlets.user.td.widgetcommonevent.shared.tr.column.ColumnDataType;
 
 import com.allen_sauer.gwt.log.client.Log;
 import com.google.gwt.core.client.GWT;
@@ -55,6 +56,12 @@ import com.sencha.gxt.widget.core.client.grid.ColumnConfig;
 import com.sencha.gxt.widget.core.client.grid.ColumnModel;
 import com.sencha.gxt.widget.core.client.grid.Grid;
 
+/**
+ * 
+ * @author giancarlo email: <a
+ *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
+ *
+ */
 public class NormalizePanel extends FramedPanel implements
 		MonitorDialogListener {
 	protected String WIDTH = "640px";
@@ -90,13 +97,46 @@ public class NormalizePanel extends FramedPanel implements
 	}
 
 	protected void create() {
+		Log.debug("Create NormalizationPanel(): [" + trId.toString() + "]");
 
 		setWidth(WIDTH);
 		setHeight(HEIGHT);
 		setHeaderVisible(false);
 		setBodyBorder(false);
-		Log.debug("Create NormalizationPanel(): [" + trId.toString() + "]");
 
+		// Normalize Button
+		normalizeButton = new TextButton("Normalize");
+		normalizeButton.setIcon(ResourceBundle.INSTANCE.tableNormalize());
+		normalizeButton.setIconAlign(IconAlign.RIGHT);
+		normalizeButton.setTitle("Normalize");
+
+		SelectHandler normalizeHandler = new SelectHandler() {
+
+			public void onSelect(SelectEvent event) {
+				onNormalize();
+
+			}
+		};
+		normalizeButton.addSelectHandler(normalizeHandler);
+
+		normalizedColumnName = new TextField();
+		FieldLabel normalizedColumnNameLabel = new FieldLabel(
+				normalizedColumnName, "Normalized column");
+		normalizedColumnNameLabel.setLabelWidth(110);
+
+		valueColumnName = new TextField();
+		FieldLabel valueColumnNameLabel = new FieldLabel(valueColumnName,
+				"Value column");
+		valueColumnNameLabel.setLabelWidth(110);
+
+		FieldLabel columnsLabel = new FieldLabel(null, "Columns to Normalize");
+		columnsLabel.setLabelWidth(150);
+		columnsLabel.getElement().applyStyles("font-weight:bold");
+
+		HBoxLayoutContainer hBox = new HBoxLayoutContainer();
+		hBox.add(normalizeButton, new BoxLayoutData(new Margins(2, 5, 2, 5)));
+
+		// Grid ColumnData
 		ColumnDataProperties props = GWT.create(ColumnDataProperties.class);
 
 		ColumnConfig<ColumnData, String> labelCol = new ColumnConfig<ColumnData, String>(
@@ -153,38 +193,6 @@ public class NormalizePanel extends FramedPanel implements
 		grid.setColumnReordering(true);
 		grid.setColumnResize(false);
 
-		// Normalize Button
-		normalizeButton = new TextButton("Normalize");
-		normalizeButton.setIcon(ResourceBundle.INSTANCE.tableNormalize());
-		normalizeButton.setIconAlign(IconAlign.RIGHT);
-		normalizeButton.setTitle("Normalize");
-
-		SelectHandler deleteHandler = new SelectHandler() {
-
-			public void onSelect(SelectEvent event) {
-				onNormalize();
-
-			}
-		};
-		normalizeButton.addSelectHandler(deleteHandler);
-
-		normalizedColumnName = new TextField();
-		FieldLabel normalizedColumnNameLabel = new FieldLabel(
-				normalizedColumnName, "Normalized column");
-		normalizedColumnNameLabel.setLabelWidth(110);
-
-		valueColumnName = new TextField();
-		FieldLabel valueColumnNameLabel = new FieldLabel(valueColumnName,
-				"Value column");
-		valueColumnNameLabel.setLabelWidth(110);
-
-		FieldLabel columnsLabel = new FieldLabel(null, "Columns to Normalize");
-		columnsLabel.setLabelWidth(150);
-
-		columnsLabel.getElement().applyStyles("font-weight:bold");
-		HBoxLayoutContainer hBox = new HBoxLayoutContainer();
-		hBox.add(normalizeButton, new BoxLayoutData(new Margins(2, 5, 2, 5)));
-
 		VerticalLayoutContainer v = new VerticalLayoutContainer();
 		v.setScrollMode(ScrollMode.AUTOY);
 		v.setAdjustForScroll(true);
@@ -230,13 +238,27 @@ public class NormalizePanel extends FramedPanel implements
 										"Error retrieving columns");
 							}
 						}
+
+						normalizeButton.disable();
 						callback.onFailure(caught);
 					}
 
 					public void onSuccess(ArrayList<ColumnData> result) {
 						Log.trace("loaded " + result.size() + " ColumnData");
-						callback.onSuccess(new ListLoadResultBean<ColumnData>(
-								result));
+						sanitizesColumns(result);
+						if (result.size() > 0) {
+							callback.onSuccess(new ListLoadResultBean<ColumnData>(
+									result));
+
+						} else {
+							normalizeButton.disable();
+							Log.error("This tabular resource has not Integer or Numeric columns, normalize is not applicable!");
+							UtilsGXT3
+									.alert("Attention",
+											"This tabular resource has not Integer or Numeric columns, normalize is not applicable!");
+							callback.onFailure(new Throwable(
+									"This tabular resource has not Integer or Numeric columns, normalize is not applicable!"));
+						}
 
 					}
 
@@ -244,6 +266,19 @@ public class NormalizePanel extends FramedPanel implements
 
 	}
 
+	protected void sanitizesColumns(ArrayList<ColumnData> columns) {
+		ArrayList<ColumnData> removableColumn = new ArrayList<ColumnData>();
+		for (ColumnData c : columns) {
+			if (!(c.getDataTypeName().compareTo(
+					ColumnDataType.Integer.toString()) == 0 || c
+					.getDataTypeName().compareTo(
+							ColumnDataType.Numeric.toString()) == 0)) {
+				removableColumn.add(c);
+			}
+		}
+		columns.removeAll(removableColumn);
+	}
+
 	protected void onNormalize() {
 		ArrayList<ColumnData> col = getSelectedItems();
 		if (col == null || col.size() < 1) {
@@ -308,7 +343,8 @@ public class NormalizePanel extends FramedPanel implements
 	public void operationComplete(OperationResult operationResult) {
 		ChangeTableWhy why = ChangeTableWhy.TABLEUPDATED;
 		ChangeTableRequestEvent changeTableRequestEvent = new ChangeTableRequestEvent(
-				ChangeTableRequestType.NORMALIZE, operationResult.getTrId(), why);
+				ChangeTableRequestType.NORMALIZE, operationResult.getTrId(),
+				why);
 		eventBus.fireEvent(changeTableRequestEvent);
 		close();
 	}
@@ -321,10 +357,12 @@ public class NormalizePanel extends FramedPanel implements
 	}
 
 	@Override
-	public void operationStopped(OperationResult operationResult, String reason, String details) {
+	public void operationStopped(OperationResult operationResult,
+			String reason, String details) {
 		ChangeTableWhy why = ChangeTableWhy.TABLECURATION;
 		ChangeTableRequestEvent changeTableRequestEvent = new ChangeTableRequestEvent(
-				ChangeTableRequestType.NORMALIZE, operationResult.getTrId(), why);
+				ChangeTableRequestType.NORMALIZE, operationResult.getTrId(),
+				why);
 		eventBus.fireEvent(changeTableRequestEvent);
 		close();