partial void Deletereq_mast(req_mast instance);
private void detach_req_masts(req_mast entity) { this.SendPropertyChanging(); entity.book_mast = null; }
private void attach_req_masts(req_mast entity) { this.SendPropertyChanging(); entity.book_mast = this; }
partial void Updatereq_mast(req_mast instance);
partial void Insertreq_mast(req_mast instance);