JPA Toplink e Oracle 10g

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package br.org.system4.MB;

import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Collection;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;

/**
 *
 * @author rodrigo.klein
 */
@Entity

@Table(name = "CODE")
@NamedQueries({@NamedQuery(name = "Code.findById", query = "SELECT c FROM Code c WHERE c.id = :id"), @NamedQuery(name = "Code.findByIum", query = "SELECT c FROM Code c WHERE c.ium = :ium"), @NamedQuery(name = "Code.findByStatus", query = "SELECT c FROM Code c WHERE c.status = :status")})
public class Code implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    
    @SequenceGenerator(name="codeseqGen",sequenceName="code_seq",allocationSize=100)
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="codeseqGen")
    
    @Column(name = "ID", nullable = false)
    private BigDecimal id;
    @Column(name = "IUM", nullable = false)
    private String ium;
    @Column(name = "STATUS")
    private String status;
    @OneToMany(mappedBy = "codeid")
    private Collection<Ium> iumCollection;

    public Code() {
    }

    public Code(BigDecimal id) {
        this.id = id;
    }

    public Code(BigDecimal id, String ium) {
        this.id = id;
        this.ium = ium;
    }

    public BigDecimal getId() {
        return id;
    }

    public void setId(BigDecimal id) {
        this.id = id;
    }

    public String getIum() {
        return ium;
    }

    public void setIum(String ium) {
        this.ium = ium;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public Collection<Ium> getIumCollection() {
        return iumCollection;
    }

    public void setIumCollection(Collection<Ium> iumCollection) {
        this.iumCollection = iumCollection;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Code)) {
            return false;
        }
        Code other = (Code) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "br.org.system4.MB.Code[id=" + id + "]";
    }

}

HTTP Status 500 -

type Exception report

message

descriptionThe server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: #{codeMB.gerar}: java.lang.RuntimeException: javax.persistence.EntityExistsException: 
Exception Description: The sequence named [code_seq] is setup incorrectly.  Its increment does not match its pre-allocation size.

root cause

javax.faces.FacesException: #{codeMB.gerar}: java.lang.RuntimeException: javax.persistence.EntityExistsException: 
Exception Description: The sequence named [code_seq] is setup incorrectly.  Its increment does not match its pre-allocation size.

root cause

javax.faces.el.EvaluationException: java.lang.RuntimeException: javax.persistence.EntityExistsException: 
Exception Description: The sequence named [code_seq] is setup incorrectly.  Its increment does not match its pre-allocation size.

root cause

java.lang.RuntimeException: javax.persistence.EntityExistsException: 
Exception Description: The sequence named [code_seq] is setup incorrectly.  Its increment does not match its pre-allocation size.

root cause

javax.persistence.EntityExistsException: 
Exception Description: The sequence named [code_seq] is setup incorrectly.  Its increment does not match its pre-allocation size.

root cause

Exception [TOPLINK-7027] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.ValidationException
Exception Description: The sequence named [code_seq] is setup incorrectly.  Its increment does not match its pre-allocation size.

note The full stack traces of the exception and its root causes are available in the Sun Java System Application Server 9.1_01 logs.