title: While doing delete operation few fields are not audited its take value as null while persisting in db
body: <p>Using <strong>Hibernate Envers</strong>, while doing create operation audit functionality is properly working data is correctly filled up in main as well as audit table but   while <strong>deleting</strong> an entry for few fields  its taking null following is the code sample:</p>
  
  <pre><code>@Audited
  @MappedSuperclass
  public abstract class A implements Serializable
  {
  private static final long   serialVersionUID    = 1L;
  @NotNull
  private Long                id;
  @NotNull
  private String              user;   
  private Timestamp           time;
  }
  
  @Entity
  @Audited
  public class B extends A
  {
  private static final long               serialVersionUID    = 1L;
  
  @EmbeddedId
  private EmbeddedId  embeddedId;
  
  @ManyToOne
  @JoinColumn(name = "CODE")
  private Code                    code;
  }
  
  @Audited
  @Embeddable
  public class EmbeddedId implements Serializable
  {
  private static final long                   serialVersionUID    = 1L;
  
  @ManyToOne
  @JoinColumn(name = "C")
  private C                       c;
  
  @ManyToOne(optional = false)
  @JoinColumns(value =
  { @JoinColumn(name = "C_ID", referencedColumnName = "C_ID"),
          @JoinColumn(name = "D_ID", referencedColumnName = "D_ID") })
  private D   d;
  
  }   
  
  @Entity
  @Audited
  public class Code extends A
  {
  private static final long   serialVersionUID    = 1L;
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Long                cId;
  
  private String              name;
  }
  </code></pre>
  
  <p><strong>All the classes are annotated with @Audited</strong>, when delete operation is fired Class B data is not properly getting audited. Data corresponding to the embeddedId (composite primary key) is reflecting in audit table but other data like (code, id, user, time) i.e member variable of that class as well as coming from inheritance are going as null in audit table.</p>
  
  <p>Please provide with the detailed solution for this issue as i am new to Envers.</p>