Viacom is suing former Harmonix shareholders, claiming they owe it a $131 million refund.
According documents published by Hollywood Reporter the company, which owned Rock Band developer Harmonix until earlier this year, paid around $150 million to Harmonix shareholders in performance related bonuses.
"This action arises from defendants' failure to return to Viacom their shares of a $131,827,980 contractual overpayment (the "Overpayment") to which they are not entitled."
Viacom claims that payment was the result of miscalculations, and the shareholders were only entitled to $18 million. The lawsuit, filed in Delaware federal court, also claims the defendants are in breach of the Merger Agreement.
The Harmonix shareholders actually filed a lawsuit against Viacom last year, claiming the company manipulated Rock Band figures to cap their earn-out payment, and say the original $150 million payment was insufficient.
Viacom acquired Harmonix in 2006. It sold Harmonix in February, and the studio was picked up by private investment group Colombus Nova.