diff --git a/YACOSCore/ejbModule/org/yacos/core/article/PreferencePK.java b/YACOSCore/ejbModule/org/yacos/core/article/PreferencePK.java
index e86cf53..25e3c14 100644
--- a/YACOSCore/ejbModule/org/yacos/core/article/PreferencePK.java
+++ b/YACOSCore/ejbModule/org/yacos/core/article/PreferencePK.java
@@ -3,7 +3,6 @@ package org.yacos.core.article;
 
 import java.io.Serializable;
 
-import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.ManyToOne;
 
@@ -26,30 +25,30 @@ public class PreferencePK implements Serializable{
 	/**
 	 * Public key, following these recomandations : http://www.jpox.org/docs/1_2/primary_key.html
 	 */
-	@Id
+	
 	@ManyToOne(targetEntity=User.class)
 	@JoinColumn(name="pcmember_id",nullable=false)
 	public User pcMember;
 	/**
 	 * Public key, following these recomandations : http://www.jpox.org/docs/1_2/primary_key.html
 	 */
-	@Id
+	
 	@ManyToOne(targetEntity=Article.class)
 	@JoinColumn(name="article_id",nullable=false)
 	public Article article;
 	
-//	@Override
-//	public boolean equals(Object obj) {
-//		if (! (obj instanceof PreferencePK) ) {
-//			return false;
-//		}
-//		PreferencePK other = (PreferencePK) obj;
-//		return this.pcMember.getLogin().equals(other.pcMember.getLogin()) &&
-//				this.article.getId() == other.article.getId();
-//	}
-//	
-//	@Override
-//	public int hashCode() {
-//		return this.pcMember.getLogin().hashCode() ^ this.article.getId();
-//	}
+	@Override
+	public boolean equals(Object obj) {
+		if (! (obj instanceof PreferencePK) ) {
+			return false;
+		}
+		PreferencePK other = (PreferencePK) obj;
+		return this.pcMember.getLogin().equals(other.pcMember.getLogin()) &&
+				this.article.getId() == other.article.getId();
+	}
+	
+	@Override
+	public int hashCode() {
+		return this.pcMember.getLogin().hashCode() ^ this.article.getId();
+	}
 }