Añade métodos hashCode y equals a dto común

	public void setId(String id) {

		this.id = id;

	}

	@Override

	public int hashCode() {

		final int prime = 31;

		int result = 1;

		result = prime * result + ((id == null) ? 0 : id.hashCode());

		return result;

	}

	@Override

	public boolean equals(Object obj) {

		if (this == obj)

			return true;

		if (obj == null)

			return false;

		if (getClass() != obj.getClass())

			return false;

		CommonDTO other = (CommonDTO) obj;

		if (id == null) {

			if (other.id != null)

				return false;

		} else if (!id.equals(other.id))

			return false;

		return true;

	}

}