When attempting to update a campaign I'm getting an error about the
biddingTransition. When sending the existing value, I get a
TRANSITION_TO_ITSELF error. If I pass null, I get a REQUIRED error.
How should this be set to successfully update the campaign if I don't
want to change the biddingStrategy that was set when the campaign was
created? The body of my soap request is as follows:

<mutate xmlns="https://adwords.google.com/api/adwords/cm/v200909";>
        <operations>
                <biddingTransition>
                        <targetBiddingStrategy xsi:type="tns:ManualCPC"></
targetBiddingStrategy>
                </biddingTransition>
                <operand>
                        <id>49379031</id>
                        <name>Test Campaign 3</name>
                        <status>Active</status>
                        <endDate>20371230</endDate>
                        <budget>
                                <period>DAILY</period>
                                <amount>
                                        <microAmount>250000</microAmount>
                                        <ComparableValue.Type/>
                                </amount>
                        </budget>
                </operand>
                <operator>SET</operator>
                <Operation.Type/>
        </operations>
</mutate>

The fault response:
    [faultcode] => soap:Server
    [faultstring] => [BiddingTransitionError.TRANSITION_TO_ITSELF @
operations[0].biddingTransition.targetBiddingStrategy]
    [detail] => Array
        (
            [ApiExceptionFault] => Array
                (
                    [message] =>
[BiddingTransitionError.TRANSITION_TO_ITSELF @
operations[0].biddingTransition.targetBiddingStrategy]
                    [ApplicationException.Type] => ApiException
                    [errors] => Array
                        (
                            [fieldPath] =>
operations[0].biddingTransition.targetBiddingStrategy
                            [trigger] =>
                            [ApiError.Type] => BiddingTransitionError
                            [reason] => TRANSITION_TO_ITSELF
                        )

                )

        )

Thanks.

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