Hide "Return to worker" button only in specific performance documents

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Hi, we are trying to hide the button "Return to worker" only in two specific performance documents.

We have tried using this EL without any luck:

#{(pageFlowScope.pCustomaryName != 'MAPPATURA E SVILUPPO COMPETENZE SUPPLY CHAIN - 2018')||(pageFlowScope.pCustomaryName != 'MAPPATURA E SVILUPPO COMPETENZE IDROELETTRICO – 2018')}

Has anyone had the same issue?

Thanks,

Laura