diff --git a/src/main/java/org/gcube/portlets/user/td/gwtservice/shared/tr/union/UnionSession.java b/src/main/java/org/gcube/portlets/user/td/gwtservice/shared/tr/union/UnionSession.java
index cd9d113..32a70af 100644
--- a/src/main/java/org/gcube/portlets/user/td/gwtservice/shared/tr/union/UnionSession.java
+++ b/src/main/java/org/gcube/portlets/user/td/gwtservice/shared/tr/union/UnionSession.java
@@ -17,6 +17,7 @@ public class UnionSession implements Serializable {
 	private static final long serialVersionUID = -1896235499708614266L;
 
 	protected TRId trId;
+	protected TabResource currentTabularResource;
 	protected TabResource unionTabularResource;
 	protected ArrayList<UnionColumnsMapping> columnsMatch;
 
@@ -24,12 +25,14 @@ public class UnionSession implements Serializable {
 
 	}
 
-	public UnionSession(TRId trId, TabResource unionTabularResource,
+	public UnionSession(TRId trId, TabResource currentTabularResource,
+			TabResource unionTabularResource,
 			ArrayList<UnionColumnsMapping> columnsMatch) {
 		this.trId = trId;
-		this.unionTabularResource=unionTabularResource;
-		this.columnsMatch=columnsMatch;
-		
+		this.currentTabularResource=currentTabularResource;
+		this.unionTabularResource = unionTabularResource;
+		this.columnsMatch = columnsMatch;
+
 	}
 
 	public TRId getTrId() {
@@ -56,11 +59,21 @@ public class UnionSession implements Serializable {
 		this.columnsMatch = columnsMatch;
 	}
 
+	public TabResource getCurrentTabularResource() {
+		return currentTabularResource;
+	}
+
+	public void setCurrentTabularResource(TabResource currentTabularResource) {
+		this.currentTabularResource = currentTabularResource;
+	}
+
 	@Override
 	public String toString() {
-		return "UnionSession [trId=" + trId + ", unionTabularResource="
+		return "UnionSession [trId=" + trId + ", currentTabularResource="
+				+ currentTabularResource + ", unionTabularResource="
 				+ unionTabularResource + ", columnsMatch=" + columnsMatch + "]";
 	}
 
 	
+
 }