ConstraintViolationException pour une cle primaire composite

Bonjour,
je travaille sur une application utilisant JPA et oracle. J'ai une classe avec une cle primaire composite

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@Entity
@Table(schema = "ACCOUNT", name = "RLOGTRACE", uniqueConstraints = @UniqueConstraint(columnNames = {"LOG_DT", "LOG_USER_ID", "LOG_TYPE"}))
public class RLogtrace implements java.io.Serializable {
 
 
	private RLogtraceId id;
 
        @EmbeddedId
        public RLogtraceId getId() {
              return this.id;
        }
............
.............
............

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@Embeddable
public class RLogtraceId implements java.io.Serializable {
 
 
	private Date logDt;
	private String logUserId;
	private Character logType;
 
	public RLogtraceId() {
	}
 
	public RLogtraceId(Date logDt, String logUserId, Character logType) {
		this.logDt = logDt;
		this.logUserId = logUserId;
		this.logType = logType;
	}
 
	@Column(name = "LOG_DT")
        @Temporal(TemporalType.TIMESTAMP)
	public Date getLogDt() {
		return this.logDt;
	}
 
	public void setLogDt(Date logDt) {
		this.logDt = logDt;
	}
 
	@Column(name = "LOG_USER_ID", length = 30)
	public String getLogUserId() {
		return this.logUserId;
	}
 
	public void setLogUserId(String logUserId) {
		this.logUserId = logUserId;
	}
 
	@Column(name = "LOG_TYPE", length = 1)
	public Character getLogType() {
		return this.logType;
	}
..........
}

avec la table RLOGTRACE suivante :

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CREATE TABLE "ACCOUNT"."RLOGTRACE"
  (
    "LOG_DT" DATE,
    "LOG_USER_ID"     VARCHAR2(30 BYTE),
    "LOG_TYPE"        CHAR(1 BYTE),
.....................
.....................
  )
 
  TABLESPACE "ACCOUNT" ;
COMMENT ON COLUMN "ACCOUNT"."R_LOGTRACE"."LOG_DT"
IS
  'Date and time of the logged event.';
  COMMENT ON COLUMN "ACCOUNT"."R_LOGTRACE"."LOG_USER_ID"
IS
  'Related user login.';
  COMMENT ON COLUMN "ACCOUNT"."R_LOGTRACE"."LOG_TYPE"
IS
  'TYPE OF event logged:
- I FOR login event,
- O FOR logout event,
 
CREATE UNIQUE INDEX "ACCOUNT"."PK_R_LOGTRACE" ON "ACCOUNT"."R_LOGTRACE"
  (
    "LOG_DT", "LOG_USER_ID", "LOG_TYPE"
  )

Quand j'essaye de créer un objet RLogtrace dans la base, j'ai l'erreur suivante :

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JDBCExceptionReporter [ERROR] ORA-00001: unique constraint (ACCOUNT.PK_R_LOGTRACE) violated
 
2010-08-19 14:39:49 AbstractFlushingEventListener [ERROR] Could not synchronize database state with session
org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
	at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)

Je ne vois pas où est l'erreur. Merci pour votre aide