public function addAcceptanceCertificates(\AgentSIB\Diadoc\Api\Proto\Events\AcceptanceCertificateAttachment $value)
    {
        if ($this->AcceptanceCertificates === null) {
            $this->AcceptanceCertificates = new \Protobuf\MessageCollection();
        }

        $this->AcceptanceCertificates->add($value);
    }