diff --git a/src/main/java/org/gcube/portlets/user/td/client/rule/RuleApplyPanel.java b/src/main/java/org/gcube/portlets/user/td/client/rule/RuleApplyPanel.java
index 4adf27c..9a0e92f 100644
--- a/src/main/java/org/gcube/portlets/user/td/client/rule/RuleApplyPanel.java
+++ b/src/main/java/org/gcube/portlets/user/td/client/rule/RuleApplyPanel.java
@@ -240,19 +240,6 @@ public class RuleApplyPanel extends FramedPanel {
 			}
 		});
 
-		/*
-		ColumnConfig<RuleDescriptionData, String> readableExpressionCol = new ColumnConfig<RuleDescriptionData, String>(
-				propsRules.readableExpression(), 160, "Expression");
-
-		readableExpressionCol.setCell(new AbstractCell<String>() {
-
-			@Override
-			public void render(Context context, String value, SafeHtmlBuilder sb) {
-				RuleApplyTemplates ruleApplyTemplates = GWT
-						.create(RuleApplyTemplates.class);
-				sb.append(ruleApplyTemplates.format(value));
-			}
-		});*/
 
 		List<ColumnConfig<RuleDescriptionData, ?>> l = new ArrayList<ColumnConfig<RuleDescriptionData, ?>>();
 		l.add(nameCol);
@@ -509,17 +496,37 @@ public class RuleApplyPanel extends FramedPanel {
 		ColumnData column = comboColumns.getCurrentValue();
 		if (column != null) {
 			ArrayList<RuleDescriptionData> selectedRules = getSelectedItems();
-			ArrayList<RuleDescriptionData> rulesToBeApplied = new ArrayList<RuleDescriptionData>();
+			ArrayList<RuleDescriptionData> rulesThatWillBeDetach = new ArrayList<RuleDescriptionData>();
+			ArrayList<RuleDescriptionData> rulesThatWillBeApplied = new ArrayList<RuleDescriptionData>();
+			HashMap<String, ArrayList<RuleDescriptionData>> columnRuleMapping = appliedRuleResponseData
+					.getColumnRuleMapping();
+			if(columnRuleMapping!=null){
+				ArrayList<RuleDescriptionData> rulesApplied = columnRuleMapping
+						.get(column.getColumnId());
+				for(RuleDescriptionData ruleApplied:rulesApplied){
+					boolean ruleStillApplied = false;
+					for (RuleDescriptionData ruleSelected : selectedRules) {
+						if (ruleSelected.getId() == ruleApplied
+								.getId()) {
+							ruleStillApplied = true;
+							break;
+						}
+					}
+					
+					if(!ruleStillApplied){
+						rulesThatWillBeDetach.add(ruleApplied);
+					}
+				}
+			}
+		
 			for (RuleDescriptionData ruleSelected : selectedRules) {
 				boolean ruleApplied = false;
-				HashMap<String, ArrayList<RuleDescriptionData>> columnRuleMapping = appliedRuleResponseData
-						.getColumnRuleMapping();
-
+			
 				if (columnRuleMapping != null) {
-					ArrayList<RuleDescriptionData> applied = columnRuleMapping
+					ArrayList<RuleDescriptionData> rulesApplied = columnRuleMapping
 							.get(column.getColumnId());
-					if (applied != null) {
-						for (RuleDescriptionData ruleAlreadyApplied : applied) {
+					if (rulesApplied != null) {
+						for (RuleDescriptionData ruleAlreadyApplied : rulesApplied) {
 							if (ruleSelected.getId() == ruleAlreadyApplied
 									.getId()) {
 								ruleApplied = true;
@@ -534,12 +541,12 @@ public class RuleApplyPanel extends FramedPanel {
 				}
 
 				if (ruleApplied == false) {
-					rulesToBeApplied.add(ruleSelected);
+					rulesThatWillBeApplied.add(ruleSelected);
 				}
 			}
 
 			ApplyColumnRulesSession applyColumnRulesSession = new ApplyColumnRulesSession(
-					trId, column, rulesToBeApplied);
+					trId, column, rulesThatWillBeApplied, rulesThatWillBeDetach);
 			parent.applyRules(applyColumnRulesSession);
 		} else {
 			Log.error("No column selected");