Update bid on Hotel Group

[Mattia Gervasoni]

Hello,

I am working on Hotel campaign on Google Ads. 

Below is the account hierarchy:

MCC XXXXXXX

     Customer Id XXXXXXXX

          Campaign Id XXXXXXX

             AdGroup Id XXXXXXX

                 Under the same AdGroup we have several Hotel Group as per image attached 

I am trying to update the bid value (field cpc_bid_micros) for one hotel. 

I built an AdGroupCriterion object and I have set a ListingGroupInfo object using HotelIdInfo as ListingDimensionInfo.

$listingGroupInfo = new Google\Ads\GoogleAds\V2\Common\ListingGroupInfo();

$listingGroupInfo->setType(Google\Ads\GoogleAds\V2\Enums\ListingGroupTypeEnum\ListingGroupType::UNIT);

//set HotelInfoID

$listingDimensionInfo = new Google\Ads\GoogleAds\V2\Common\ListingDimensionInfo();

$hotelIdInfo = new Google\Ads\GoogleAds\V2\Common\HotelIdInfo();

$hotelIdInfo->setValue(new Google\Protobuf\StringValue(['value' => $hotel_id]));

Then I call the update operation on the cpc_bid_micros field as per below code, using FieldMask: 

$adGroupCriterion->setCpcBidMicros(new Google\Protobuf\Int64Value(['value' => $bid_value_micros]));

$adGroupCriterionOperation = new \Google\Ads\GoogleAds\V2\Services\AdGroupCriterionOperation();

$adGroupCriterionOperation->setUpdate($adGroupCriterion);

$fieldMask = new Google\Protobuf\FieldMask();

$fieldMask->setPaths(array("cpc_bid_micros"));

$adGroupCriterionOperation->setUpdateMask($fieldMask);

     

I am getting the following error:

"errorCode": {

"fieldError": "FIELD_CANNOT_BE_CLEARED"

},

"message": "The field cannot be cleared.", 

Any suggests?