Barcelona have been fined €300 following a complaint from Atletico Madrid over their pursuit of Antoine Griezmann.
Griezmann moved to Camp Nou in July after a lengthy transfer saga and some debate over the France forward's release clause, which dropped from €200million to €120m at the end of June.
Atletico were less than happy with their rivals' conduct, claiming they reached an agreement with the player when the €200m fee was still active, and raised the issue with the Royal Spanish Football Federation.
The governing body returned a ruling on Thursday, finding Barca guilty of violating article 126 of its disciplinary code.
A symbolic monetary penalty was imposed, while Griezmann escaped without sanction.
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The decision can be challenged if an appeal is lodged within the next 10 business days.
It had been reported Barca were facing a one-game stadium closure, but no such punishment was handed down.
