"Fault occurred while processing." when doing bidtransition test

[Peer Jakobsen (AdWords API Guru)]

We test a campaign for conversion optimizer eligibility by doing a
bidtransition test (validateOnly). On some of the campaigns we get a
high level soap error. It seems to happen on campaigns that run ACE
(Advanced Campaign Experiment)

Soap response:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";>
        <soap:Header>
                <ResponseHeader 
xmlns="https://adwords.google.com/api/adwords/cm/
v200909">
                        <requestId>983004778bdef086a1c12fa497eb720c</requestId>
                        <operations>1</operations>
                        <responseTime>7932</responseTime>
                        <units>1</units>
                </ResponseHeader>
        </soap:Header>
        <soap:Body>
                <soap:Fault>
                        <faultcode>soap:Server</faultcode>
                        <faultstring>Fault occurred while 
processing.</faultstring>
                </soap:Fault>
        </soap:Body>
</soap:Envelope>

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