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 ec080c4..4dbfab7 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
@@ -832,7 +832,7 @@ public interface TDGWTService extends RemoteService {
 	 * @return
 	 * @throws TDGWTServiceException
 	 */
-	public String startChangeColumnsPosition(ChangeColumnsPositionSession changeColumnsPositionSession)
+	public void startChangeColumnsPosition(ChangeColumnsPositionSession changeColumnsPositionSession)
 			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 0f56bfe..d9ac6ff 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
@@ -310,7 +310,7 @@ public interface TDGWTServiceAsync {
 			AsyncCallback<String> callback);
 	
 	void startChangeColumnsPosition(ChangeColumnsPositionSession changeColumnsPositionSession,
-			AsyncCallback<String> callback);
+			AsyncCallback<Void> callback);
 	
 	
 	/*
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 da5ff7b..d15dc03 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
@@ -7982,7 +7982,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 	 * {@inheritDoc}
 	 */
 	@Override
-	public String startChangeColumnsPosition(ChangeColumnsPositionSession changeColumnsPositionSession)
+	public void startChangeColumnsPosition(ChangeColumnsPositionSession changeColumnsPositionSession)
 			throws TDGWTServiceException {
 		try {
 			HttpSession session = this.getThreadLocalRequest().getSession();
@@ -8017,12 +8017,9 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 			}
 
 			logger.debug("OperationInvocation: \n" + invocation.toString());
-			Task trTask = service.execute(invocation, tabularResourceId);
-			logger.debug("Start Task on service: TaskId " + trTask.getId());
-			TaskWrapper taskWrapper = new TaskWrapper(trTask,
-					UIOperationsId.ChangeColumnsPosition, changeColumnsPositionSession.getTrId());
-			SessionUtil.setStartedTask(session, taskWrapper);
-			return trTask.getId().getValue();
+			service.executeSynchMetadataOperation(invocation, tabularResourceId);
+			
+			return;
 
 		} catch (TDGWTServiceException e) {
 			throw e;