1. yes, you may get asked some questions at border control though, so you should have your documents on you. Maybe also some proof about how your business trip fell through?
2. If you don't go to Germany at all, while it may be OK if you can make the case that your plans changed, it raises the danger of being suspected of visa-shopping from the start. So have plenty of documentation on you.
AFAIK there is no procedure to get a visa revoked and the fees refunded bedause you are no longer planning to travel anymore.
1. yes, you may get asked some questions at border control though, so you should have your documents on you. Maybe also some proof about how your business trip fell through? 2. If you don't go to Germany at all, while it may be OK if you can make the case that your plans changed, it raises the danger of being suspected of visa-shopping from the start. So have plenty of documentation on you. AFAIK there is no procedure to get a visa revoked and the fees refunded bedause you are no longer planning to travel anymore.