CREATE TABLE Parent(
  Parent_Id NUMERIC(5, 0)  NOT NULL ,
  Descript VARCHAR(60)  NOT NULL,
  PRIMARY KEY(Parent_Id)
);

CREATE TABLE State (
  Parent_Id NUMERIC(5, 0)  NOT NULL,
  State_Id VARCHAR(2)  NOT NULL,
  Descript VARCHAR(60)  NOT NULL,
PRIMARY KEY(Parent_Id, State_Id),
INDEX IDX_S(Parent_Id),
  FOREIGN KEY(Parent_Id)
      REFERENCES Parent(Parent_Id)
      ON DELETE NO ACTION
      ON UPDATE NO ACTION);

CREATE TABLE Area (
  Parent_Id NUMERIC(5, 0)  NOT NULL,
  State_Id VARCHAR(2)  NOT NULL,
  Area_Code NUMERIC(5,0)  NOT NULL,
  Descript VARCHAR(85)  NULL,
PRIMARY KEY(Parent_Id, State_Id, Area_Code) ,
INDEX IDX_A(Parent_Id, State_Id),
  FOREIGN KEY(Parent_Id, State_Id)
    REFERENCES State(Parent_Id, State_Id)
      ON DELETE NO ACTION
      ON UPDATE NO ACTION);

CREATE TABLE Result(
  Parent_Id   NUMERIC(5, 0) NOT NULL,
  State_Id    VARCHAR(2)    NOT NULL,
  Result_Code NUMERIC(6, 0) NOT NULL,
  Area_Code   NUMERIC(5, 0) NOT NULL,
  Result_Text VARCHAR(80)   NOT NULL,
  PRIMARY KEY(Main_Id, State_Id, Result_Code),
  INDEX IDX_State(Parent_Id, State_Id),
  FOREIGN KEY       (Parent_Id, State_Id)
    REFERENCES State(Parent_Id, State_Id)
      ON DELETE NO ACTION
      ON UPDATE NO ACTION,
  INDEX IDX_Area(Parent_Id, State_Id, Area_Code),
  FOREIGN KEY      (Parent_Id, State_Id, Area_Code)
    REFERENCES Area(Parent_Id, State_Id, Area_Code)
      ON DELETE NO ACTION
      ON UPDATE NO ACTION
);

package dbo;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="Parent")
public class Parent{
  @Id
  @Column(name="Parent_Id", precision=5, scale=0)
  private int parentId;
 
  @Column(name="Descript", length=60)
  private String descript;

  public int getParentId(){
    return parentId;
  }

  public void getParentId(int parentId){
    this.parentId= parentId;
  }

  public String getDescript(){
    return descript;
  }

  public void setDescript(String descript){
    this.descript= descript;
  }
 
}

package dbo;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="State")
public class State implements Serializable{
  private static final long serialVersionUID= 6030875192113837000L;

  @Id
  private PKState id;
 
  @Column(name="Descript", length=60)
  private String descript;

  public PKState getId(){
    return id;
  }

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

  public String getDescript(){
    return descript;
  }

  public void setDescript(String descript){
    this.descript= descript;
  }

  public boolean equals(Object state){
    return state!= null && state instanceof State &&
           ((State)state).getId().equals(id);
  }
 
  public int hashCode(){
    return id.hashCode();
  }
 
}

package dbo;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Embeddable;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;

@Embeddable
public class PKState implements Serializable{
  private static final long serialVersionUID= 4994565448557556944L;
 
  @ManyToOne
  @JoinColumn(name="Parent_Id")
  private Parent parent;
 
  @Column(name="State_Id")
  private String stateId;
 
  public PKState(){
    parent = new Parent();
  }
 
  public Parent getParent(){
    return parent;
  }

  public void setParent(Parent parent){
    this.parent= parent;
  }
 
  public String getStateId(){
    return stateId;
  }

  public void setStateId(String stateId){
    this.stateId= stateId;
  }
 
  public boolean equals(Object id){
    return id != null && id instanceof PKState &&
           ((PKState)id).getParent().getParentId() == parent.getParentId() &&
           ((PKState)id).getStateId().equals(stateId);
  }
 
  public int hashCode(){
    return 3*parent.getParentId();
  }

}

package dbo;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="Area")
public class Area implements Serializable{
  private static final long serialVersionUID= -1465717945781167218L;
 
  @Id
  private PKArea id;
 
  @Column(name="Descript", length=85)
  private String descript;

  public PKArea getId(){
    return id;
  }

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

  public String getDescript(){
    return descript;
  }

  public void setDescript(String descript){
    this.descript= descript;
  }
 
  public boolean equals(Object area){
    return area != null && area instanceof Area &&
           ((Area)area).getId().equals(id);
  }
 
  public int hashCode(){
    return id.hashCode();
  }

}

package dbo;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Embeddable;
import javax.persistence.JoinColumn;
import javax.persistence.JoinColumns;
import javax.persistence.ManyToOne;

@Embeddable
public class PKArea implements Serializable{
  private static final long serialVersionUID= -137835683278214689L;
 
  @ManyToOne
  @JoinColumns({
    @JoinColumn(name="Parent_Id"),
    @JoinColumn(name="State_Id")
  })
  private State state;
 
  @Column(name="Area_Code", precision=5, scale=0)
  private int areaCode;
 
  public PKArea(){
    state= new State();
  }

  public State getState(){
    return state;
  }

  public void setEstado(State state){
    this.state= state;
  }

  public int getAreaCode(){
    return areaCode;
  }

  public void setAreaCode(int areaCode){
    this.areaCode= areaCode;
  }
 
  public boolean equals(Object id){
    return id != null && id instanceof PKArea &&
           ((PKArea )id).getEstado().equals(state) &&
           ((PKArea )id).getAreaCode() == areaCode;
  }
 
  public int hashCode(){
    return 7*areaCode;
  }

}

Result result = ....;
result.getArea().getId()...;
result.getParent()....;