MGA Entertainment has moved to vacate a $23 million arbitration award made to Orrick, Herrington & Sutcliffe to compensate the firm for its work on behalf of the toymaker in its hotly contested battle with Mattel over its Bratz dolls.

MGA Entertainment — represented by Connor, Fletcher & Williams — argued in court papers filed Monday in Orange County Superior Court, MGA Entertainment v. Orrick, Herrington & Sutcliffe, 00628354, that the arbitrators did not have the authority to grant the preliminary award in the middle of arbitration. On Jan. 25, a JAMS panel had issued a partial award to Orrick that consisted of a $23 million lien on the proceeds of MGA Entertainment’s copyright case against Mattel Inc., according to the filing. The award also called for Orrick to submit a $100,000 bond to maintain the prejudgment lien.