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