diff --git a/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTService.java b/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTService.java
index 2937773..a23038a 100644
--- a/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTService.java
+++ b/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTService.java
@@ -52,11 +52,9 @@ import org.gcube.portlets.user.td.gwtservice.shared.tr.column.DeleteColumnSessio
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.LabelColumnMonitor;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.LabelColumnSession;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.MergeColumnMonitor;
-import org.gcube.portlets.user.td.gwtservice.shared.tr.column.MergeColumnSession;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.ReplaceColumnMonitor;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.ReplaceColumnSession;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.SplitColumnMonitor;
-import org.gcube.portlets.user.td.gwtservice.shared.tr.column.SplitColumnSession;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.type.ChangeColumnTypeMonitor;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.type.ChangeColumnTypeSession;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.metadata.TRMetadata;
@@ -784,18 +782,20 @@ public interface TDGWTService extends RemoteService {
 	 * 
 	 * @return
 	 * @throws TDGWTServiceException
-	 */
+	*/ 
 	public SplitColumnMonitor getSplitColumnMonitor()
 			throws TDGWTServiceException;
-
+	
 	/**
 	 * Start split column
 	 * 
 	 * @param splitColumnSession
 	 * @throws TDGWTServiceException
-	 */
+	
 	public void startSplitColumn(SplitColumnSession splitColumnSession)
 			throws TDGWTServiceException;
+	*/
+	
 	
 	/**
 	 * Get Operation Monitor during the Merge Column operation
@@ -812,10 +812,10 @@ public interface TDGWTService extends RemoteService {
 	 * 
 	 * @param splitColumnSession
 	 * @throws TDGWTServiceException
-	 */
+	
 	public void startMergeColumn(MergeColumnSession mergeColumnSession)
 			throws TDGWTServiceException;
-
+	*/
 	
 	
 	
diff --git a/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTServiceAsync.java b/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTServiceAsync.java
index d20940a..2b52c0c 100644
--- a/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTServiceAsync.java
+++ b/src/main/java/org/gcube/portlets/user/td/gwtservice/client/rpc/TDGWTServiceAsync.java
@@ -51,11 +51,9 @@ import org.gcube.portlets.user.td.gwtservice.shared.tr.column.DeleteColumnSessio
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.LabelColumnMonitor;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.LabelColumnSession;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.MergeColumnMonitor;
-import org.gcube.portlets.user.td.gwtservice.shared.tr.column.MergeColumnSession;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.ReplaceColumnMonitor;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.ReplaceColumnSession;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.SplitColumnMonitor;
-import org.gcube.portlets.user.td.gwtservice.shared.tr.column.SplitColumnSession;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.type.ChangeColumnTypeMonitor;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.type.ChangeColumnTypeSession;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.metadata.TRMetadata;
@@ -221,9 +219,9 @@ public interface TDGWTServiceAsync {
 	void startLabelColumn(LabelColumnSession labelColumnSession,AsyncCallback<Void> callback);	
 	
 	void getSplitColumnMonitor(AsyncCallback<SplitColumnMonitor> callback);
-	void startSplitColumn(SplitColumnSession splitColumnSession,AsyncCallback<Void> callback);	
+	/*void startSplitColumn(SplitColumnSession splitColumnSession,AsyncCallback<Void> callback);*/	
 	void getMergeColumnMonitor(AsyncCallback<MergeColumnMonitor> callback);
-	void startSplitColumn(MergeColumnSession mergeColumnSession,AsyncCallback<Void> callback);	
+	/*void startSplitColumn(MergeColumnSession mergeColumnSession,AsyncCallback<Void> callback);	*/
 
 	
 	//BatchReplace Operation
diff --git a/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java b/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java
index bed3e71..4b0df84 100644
--- a/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java
@@ -7678,7 +7678,6 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 	}
 
 	// TODO
-	@Override
 	public void startSplitColumn(SplitColumnSession splitColumnSession)
 			throws TDGWTServiceException {
 		try {
@@ -7824,7 +7823,6 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 	}
 
 	// TODO
-	@Override
 	public void startMergeColumn(MergeColumnSession mergeColumnSession)
 			throws TDGWTServiceException {
 		try {