Can employer who filed H1 for me, revoke my initial H1 case(Since my project is getting ended on may) and update with new employer details if I get a new project by the time my H1 got picked(For which i have sent all perfect documents saying that my project is long term till 3 more years in all letters though(This was regarding my lost job), and also can he revoke only once my H1 got picked or he can do before it gets picked also ?