Those pesky Falcon Wing doors have surely cost Tesla a bundle in cash and headache powders. Now the company has filed a federal lawsuit against a German parts supplier in connection with the door debacle.

According to the lawsuit, Hoerbiger Automotive Comfort Systems says that Tesla owes it money for work the supplier was promised. Tesla says that it owes nothing beyond the $3 million it has already paid for prototype parts and engineering.

“We were forced to file this lawsuit after Hoerbiger decided to ignore their contracts with us and instead demanded a large sum of money to which they are not entitled,” said a Tesla spokeswoman.

According to Tesla, it paid Hoerbiger to develop the magical doors, but the company’s prototypes weren’t up to standards – they leaked oil and sagged or produced excessive heat, causing them to fail. In May 2015, Tesla dropped Hoerbiger’s design and hired a new supplier.

“Tesla incurred millions of dollars in damages, including, but not limited to costs of re-tooling the entire vehicle in order to support a different engineering solution,” the lawsuit says.

Source: Wall Street Journal