Error at mission

[CasefahrerNico]

Hello everyone! I accepted a mission “Harvesting Beets”. At the same time, a second mission “harvesting beets” was accepted. First one field was cleared, then the second was started. The first mission was completed, but was not completed yet because I used the machines for the second mission. After the game was saved and closed, it opened the next day. The first mission was gone (as if completed, the field was reordered, only I didn't get any money) but the vehicles are still there and cannot be returned. Everything went perfectly on the second mission. How do I get rid of the machines from the first mission?

Kind regards

Edit don_apple: topic moved from german to english section.