Hello guys. I think I just made a mess when selling a car (because I have relied on statements in the net and some acquaintances). I sold as I said a car but stupidly already gave the Fzg letter to the buyer. – Full purchase amount was paid. – Purchase contract is of course available and – I also have the vehicle license as well as the signs (he had brought his own – red). What do I do now? Replace the purchase contract quasi the letter? or get I didn’t sign off the car without a letter?