@Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        WorkPackagePK other = (WorkPackagePK) obj;
        if (proj_ID != other.proj_ID)
            return false;
        if (wp_ID == null) {
            if (other.wp_ID != null)
                return false;
        } else if (!wp_ID.equals(other.wp_ID))
            return false;
        return true;
    }