diff --git a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/TwinColumnSelection/TwinColumnSelectionMainPanel.java b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/TwinColumnSelection/TwinColumnSelectionMainPanel.java
index 7e81515..6ba7c4e 100644
--- a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/TwinColumnSelection/TwinColumnSelectionMainPanel.java
+++ b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/TwinColumnSelection/TwinColumnSelectionMainPanel.java
@@ -296,17 +296,18 @@ public class TwinColumnSelectionMainPanel extends Composite{
 		while (iterator.hasNext()) {
 			ResourceElementBean resourceElementBean = (ResourceElementBean) iterator
 					.next();
-			resourceElementBean.setMovedToRight(true);		
-			boolean contains = dataProviderRight.getList().contains(resourceElementBean);
-			if(!contains)
-				dataProviderRight.getList().add(resourceElementBean);
-		}
+			resourceElementBean.setMovedToRight(true);	
 
-		// refresh providers
-		dataProviderLeft.flush();
-		dataProviderRight.flush();
-		dataProviderLeft.refresh();
-		dataProviderRight.refresh();
+			int indexRight = dataProviderRight.getList().indexOf(resourceElementBean);
+			if(indexRight >= 0)
+				dataProviderRight.getList().set(indexRight, resourceElementBean);
+			else
+				dataProviderRight.getList().add(resourceElementBean);
+
+			int indexLeft = dataProviderLeft.getList().indexOf(resourceElementBean);
+			if(indexLeft >= 0)
+				dataProviderLeft.getList().set(indexLeft, resourceElementBean);
+		}
 	}
 
 	/**
@@ -321,16 +322,17 @@ public class TwinColumnSelectionMainPanel extends Composite{
 		Iterator<ResourceElementBean> iterator = setSelected.iterator();
 		while (iterator.hasNext()) {
 			ResourceElementBean resourceElementBean = (ResourceElementBean) iterator.next();
-			int index = dataProviderLeft.getList().indexOf(resourceElementBean);
-			if(index != -1){
-				resourceElementBean.setMovedToRight(false);
-				dataProviderLeft.getList().set(index, resourceElementBean); // replace
-			}
-		}
+			resourceElementBean.setMovedToRight(false);
 
-		// refresh providers
-		dataProviderRight.flush();
-		dataProviderRight.refresh();
+			int indexLeft = dataProviderLeft.getList().indexOf(resourceElementBean);
+			if(indexLeft != -1)
+				dataProviderLeft.getList().set(indexLeft, resourceElementBean); // replace
+			else
+				dataProviderLeft.getList().add(resourceElementBean);
+			int indexRight = dataProviderRight.getList().indexOf(resourceElementBean);
+			if(indexRight >= 0)
+				dataProviderLeft.getList().set(indexLeft, resourceElementBean);
+		}
 	}
 
 }