The Barcelona football club must pay a fine of half a million euros, the Court of Arbitration for Sport confirmed.
CAs rejected Barca's appeal against Uefa's ruling that it "deliberately" misreported revenue in an attempt to comply with financial rules.
In its explanation, the court even stated that the sentence was "rather mild".
The case stems from the way Barcelona handled the financial statements of a deal it secured to sell a percentage of its broadcasting rights over the next 25 years.
Uefa said the report was "inaccurate and inconsistent" with its rules, which aim to ensure responsible spending by European football clubs.
The Catalans secured contracts worth 2022 million euros in 667,5 to sell 25 percent of their future earnings from La Liga broadcasts over the next 25 years.
Uefa said the club then deliberately misreported one of those contracts and "overstated its break-even results by 267 million euros" in its financial statements.
According to UEFA rules, clubs are allowed certain losses during a three-year period.
Sales of intangible assets, such as future earnings from broadcasting rights, are not allowed to be included in break-even calculations.
Barcelona has had major financial problems in recent years, due to which they had to allow Lionel Messi to leave the club in 2021 without compensation.
Bonus video:
