Contribute correction: Lagerbestandsverwaltung

  _  _      ___      ______     ___    
 | \| ||   / _ \\   /_   _//   / _ \\  
 |  ' ||  / //\ \\  `-| |,-   / //\ \\ 
 | .  || |  ___  ||   | ||   |  ___  ||
 |_|\_|| |_||  |_||   |_||   |_||  |_||
 `-` -`  `-`   `-`    `-`'   `-`   `-`