contentBidTypeCriterionGroup doesn't mutate

Hello!

I need to turn on custom bids for placements.

I'm trying to mutate Adgroup. setting contentBidTypeCriterionGroup to 'PLACEMENT'
as it is recommended here
https://groups.google.com/forum/#!topic/adwords-api/W1Kl2fmKbqI

Here is my code

    $adGroupId = '...adgroup code...';
    $adGroupService = $user->GetService('AdGroupService', ADWORDS_VERSION);

    $operations = array();

   
    $adGroup = new AdGroup();

    $adGroup->id = $adGroupId;

    

    $adGroup->contentBidTypeCriterionGroup = 'PLACEMENT';        

    $operation = new AdGroupOperation();

    $operation->operand = $adGroup;

    $operation->operator = 'SET';

    $operations[] = $operation;
    $result = $adGroupService->mutate($operations);

And when i run this code, param doesn't change.
It simply doesn't send this change in SOAP request.

API v201603

What am I doing wrong?

<?xml version="1.0"?>

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">

  <soap:Header>

    <ResponseHeader xmlns="https://adwords.google.com/api/adwords/cm/v201603">

      <requestId>....</requestId>

      <serviceName>AdGroupService</serviceName>

      <methodName>mutate</methodName>

      <operations>1</operations>

      <responseTime>70</responseTime>

    </ResponseHeader>

  </soap:Header>

  <soap:Body>

    <mutateResponse xmlns="https://adwords.google.com/api/adwords/cm/v201603">

      <rval>

        <ListReturnValue.Type>AdGroupReturnValue</ListReturnValue.Type>

        <value>

          <id>30649754764</id>

          <campaignId>603388708</campaignId>

          <campaignName>Russia - CPM Test v1.10</campaignName>

          <name>hotweb.bid 200x200</name>

          <status>ENABLED</status>

          <settings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="TargetingSetting">

            <Setting.Type>TargetingSetting</Setting.Type>

            <details>

              <criterionTypeGroup>PLACEMENT</criterionTypeGroup>

              <targetAll>true</targetAll>

            </details>

          </settings>

          <biddingStrategyConfiguration>

            <biddingStrategyType>MANUAL_CPM</biddingStrategyType>

            <biddingStrategySource>CAMPAIGN</biddingStrategySource>

            <biddingScheme xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="ManualCpmBiddingScheme">

              <BiddingScheme.Type>ManualCpmBiddingScheme</BiddingScheme.Type>

            </biddingScheme>

            <bids xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="CpcBid">

              <Bids.Type>CpcBid</Bids.Type>

              <bid>

                <ComparableValue.Type>Money</ComparableValue.Type>

                <microAmount>10000</microAmount>

              </bid>

              <cpcBidSource>ADGROUP</cpcBidSource>

            </bids>

            <bids xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="CpmBid">

              <Bids.Type>CpmBid</Bids.Type>

              <bid>

                <ComparableValue.Type>Money</ComparableValue.Type>

                <microAmount>15000000</microAmount>

              </bid>

              <cpmBidSource>ADGROUP</cpmBidSource>

            </bids>

          </biddingStrategyConfiguration>

        </value>

      </rval>

    </mutateResponse>

  </soap:Body>

</soap:Envelope>

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