That's the problem.
Those holding the risk may want to make them produce against contract. You know, just to prove they can.
The big question in the world of international finance right now is: Can they produce? And: Will the German government bail them out?
If either of those is "no", the bank is in trouble because it appears the big money may be running from them.
If both are "no", they're already dead.
You can’t do that. If the contract says they will pay you if the central bank rate goes above .5%, you won’t find out if they can or not until the bank rate hits .5% - unless there is a clause saying they have to put up some sort of escrow or collateral if their credit rating is cut to junk. Most people buying this sort of derivative don’t have that kind of clause, if it is a regular wholesale customer, although another financial institution might be have a little more foresight (and cynicism).