Judging by the wsdl it is expecting to have biddingTransition nested in the
opertaions as a campaign operation rather than nested in a campaign
operation as an operand:
<complexType name="CampaignOperation">
<annotation>
<documentation>
An operation on an AdWords campaign.
<p class="note"><b>Note:</b> The <code>REMOVE</code> operator
is not
supported. To remove a campaign, set its {@link Campaign#status
status}
to <code>DELETED</code>.</p>
</documentation>
</annotation>
<complexContent>
<extension base="tns:Operation">
<sequence>
<element maxOccurs="1" minOccurs="0" name="biddingTransition"
type="tns:BiddingTransition">
<annotation>
<documentation>
Changes the bidding strategy for this campaign. Use
only when performing a
<code>SET</code> operation.
</documentation>
</annotation>
</element>
<element maxOccurs="1" minOccurs="0" name="operand"
type="tns:Campaign">
<annotation>
<documentation>
<span class="constraint Required">This field is required and
should not be {@code null}.</span>
</documentation>
</annotation>
</element>
</sequence>
</extension>
</complexContent>
</complexType>
Forgive the terrible indentation, hope this helps you.
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