diff --git a/src/main/java/org/gcube/portlets/user/td/gwtservice/shared/tr/DefNewColumn.java b/src/main/java/org/gcube/portlets/user/td/gwtservice/shared/tr/DefNewColumn.java
index 1df9a9b..b24a365 100644
--- a/src/main/java/org/gcube/portlets/user/td/gwtservice/shared/tr/DefNewColumn.java
+++ b/src/main/java/org/gcube/portlets/user/td/gwtservice/shared/tr/DefNewColumn.java
@@ -13,7 +13,7 @@ public class DefNewColumn implements Serializable {
 
 	private static final long serialVersionUID = 7467523779864189492L;
 	
-	protected int id; //Only for grid or combo
+	protected String id; //Only for grid or combo
 	protected ColumnTypeCode columnType;
 	protected String defaultValue;
 	protected String label;
@@ -23,8 +23,8 @@ public class DefNewColumn implements Serializable {
 
 	}
 
-	public DefNewColumn(int id, ColumnTypeCode columnType,
-			String defaultValue, String label,String localeName) {
+	public DefNewColumn(String id, String label,
+			ColumnTypeCode columnType, String localeName,String defaultValue) {
 		this.columnType=columnType;
 		this.defaultValue=defaultValue;
 		this.label=label;
@@ -55,11 +55,11 @@ public class DefNewColumn implements Serializable {
 		this.defaultValue = defaultValue;
 	}
 
-	public int getId() {
+	public String getId() {
 		return id;
 	}
 
-	public void setId(int id) {
+	public void setId(String id) {
 		this.id = id;
 	}