Adjust bids with bid modifiers

Page Summary

• The Google Ads API allows you to set bid adjustments for Hotel ads at both the campaign and ad group levels.

• Setting bid adjustments at the ad group level requires creating specific objects like HotelAdvanceBookingWindowInfo or HotelDateSelectionTypeInfo and associating them with an AdGroupBidModifier object.

• The examples provided demonstrate how to create ad group bid modifiers based on hotel check-in day and length of stay using various programming languages.

You can use the Google Ads API to set bid adjustments (also called bid modifiers) for hotel ads. For details about how bid adjustments work, see About bid adjustments for Hotel ads.

Campaign-level bid adjustments

To use the Google Ads API to set bid adjustments at the campaign level, see Manage bid modifiers.

Ad group-level bid adjustments

Starting in v26, the five hotel-specific criteria on AdGroupBidModifier are renamed to vertical-agnostic names (such as start day of week and length of booking), replacing the hotel-specific criteria from earlier versions. These bid adjustments remain supported only for hotel ads—both in Hotel campaigns and in Search Campaigns for Travel. Existing bid modifiers created in v25 or earlier carry over automatically with identical criterion IDs and resource names. For a summary of all v26 breaking changes, see the release notes.

To set bid adjustments at the ad group level, create a criterion object for the dimension you want to target and set its fields to the appropriate values. In v26 and later, use the vertical-agnostic criterion objects: AdvanceBookingWindowInfo, UserSetDatesInfo, StartDayOfWeekInfo, LengthOfBookingInfo, or StartDateRangeInfo. In v25 and earlier, use the hotel-specific criterion objects: HotelAdvanceBookingWindowInfo, HotelDateSelectionTypeInfo, HotelCheckInDayInfo, HotelLengthOfStayInfo, or HotelCheckInDateRangeInfo.

The following table summarizes the AdGroupBidModifier criterion fields, message types, subfields, and valid bid_modifier ranges across API versions:

v25 and earlier	v26 and later	Subfields and types	Description and valid range
hotel_date_selection_type (HotelDateSelectionTypeInfo)	user_set_dates (UserSetDatesInfo)	type: DateSelectionType in v26 (HotelDateSelectionType in v25). Values: DEFAULT_SELECTION (criterion ID 50), USER_SELECTED (criterion ID 51). IMMUTABLE.	Default dates versus user-selected dates. Valid bid_modifier range: 0.5 to 2.0 (does not support 0 opt-out).
hotel_advance_booking_window (HotelAdvanceBookingWindowInfo)	advance_booking_window (AdvanceBookingWindowInfo)	min_days, max_days (int64, 0–330). IMMUTABLE, required.	Number of days before the start date of the booking. Valid bid_modifier range: 0.1 to 10.0, or 0 to opt out.
hotel_length_of_stay (HotelLengthOfStayInfo)	length_of_booking (LengthOfBookingInfo)	min_days, max_days in v26 (min_nights, max_nights in v25) (int64, 1–30). IMMUTABLE, required.	Length of the booking. Valid bid_modifier range: 0.1 to 10.0, or 0 to opt out.
hotel_check_in_day (HotelCheckInDayInfo)	start_day_of_week (StartDayOfWeekInfo)	day_of_week (DayOfWeek, criterion IDs 60–66 for MONDAY–SUNDAY). IMMUTABLE.	Day of the week of the booking start date. Valid bid_modifier range: 0.1 to 10.0, or 0 to opt out.
hotel_check_in_date_range (HotelCheckInDateRangeInfo)	start_date_range (StartDateRangeInfo)	start_date, end_date (string, YYYY-MM-DD). IMMUTABLE, required.	Date range of the booking start date. Valid bid_modifier range: 0.1 to 10.0, or 0 to opt out.

Note: In LengthOfBookingInfo, min_nights and max_nights are renamed to min_days and max_days, and existing numeric values carry over 1:1 (for example, hotel_length_of_stay.min_nights = 3 is returned as length_of_booking.min_days = 3 in v26). When migrating to v26, copy existing numeric values directly without converting between nights and days.

For example, to create an ad group bid modifier using an advance booking window between 30 and 60 days in v26 and later, create an AdvanceBookingWindowInfo object (or HotelAdvanceBookingWindowInfo in v25 and earlier) and set min_days to 30 and max_days to 60.

Associate the criterion object with an AdGroupBidModifier object using the corresponding criterion field (advance_booking_window, user_set_dates, start_day_of_week, length_of_booking, or start_date_range), specify the resource name of the target ad group using ad_group, and set the bid_modifier field to a multiplier:

• advance_booking_window, length_of_booking, start_day_of_week, start_date_range, and device: Specify a multiplier from 0.1 to 10.0 (for example, 1.5 for a +50% adjustment, or 0.5 for a -50% adjustment), or set bid_modifier to 0 (0.0) to opt out (-100%) of the criterion.
• user_set_dates: Specify a multiplier from 0.5 to 2.0. Setting bid_modifier to 0 is not supported for user_set_dates and returns RangeError.TOO_LOW.

For more details about how each adjustment type works, see About bid adjustments for Hotel ads.

Note: These travel dimensions can be set only at the ad group level. Device bid adjustments can be set at both the campaign and ad group levels; if an ad group has a device adjustment, it overrides the campaign's device adjustment (unless the campaign opts out of that device with bid_modifier = 0).

The following reporting segment and resource limit details also apply in v26:

• segments.user_set_dates: In v26 and later, the enum type of segments.user_set_dates is DateSelectionType (updated from HotelDateSelectionType in v25 and earlier; Hotel campaign reports using segments.hotel_date_selection_type continue to use HotelDateSelectionType). The other itinerary segments (segments.advance_booking_window, segments.length_of_booking, segments.start_date, and segments.start_day_of_week) are unchanged.
• Resource limits: ResourceLimitType.HOTEL_ADVANCE_BOOKING_WINDOW_BID_MODIFIERS_PER_AD_GROUP and ResourceLimitType.HOTEL_CHECK_IN_DATE_RANGE_BID_MODIFIERS_PER_AD_GROUP retain their existing names in v26.

Note: The following client library code example shows v25 hotel_* field names. In v26 and later, use the vertical-agnostic field and message names listed in the preceding table.

Java

private void runExample(GoogleAdsClient googleAdsClient, long customerId, long adGroupId) {
  List<AdGroupBidModifierOperation> operations = new ArrayList<>();

  // Constructs the ad group resource name to use for each bid modifier.
  String adGroupResourceName = ResourceNames.adGroup(customerId, adGroupId);

  // 1) Creates an ad group bid modifier based on the hotel check-in day.
  AdGroupBidModifier checkInDayAdGroupBidModifier =
      AdGroupBidModifier.newBuilder()
          // Sets the resource name to the ad group resource name joined with the criterion ID
          // whose value corresponds to the desired check-in day.
          .setAdGroup(adGroupResourceName)
          .setStartDayOfWeek(StartDayOfWeekInfo.newBuilder().setDayOfWeek(DayOfWeek.MONDAY))
          // Sets the bid modifier value to 150%.
          .setBidModifier(1.5d)
          .build();
  operations.add(
      AdGroupBidModifierOperation.newBuilder().setCreate(checkInDayAdGroupBidModifier).build());

  // 2) Creates an ad group bid modifier based on the hotel length of stay.
  AdGroupBidModifier lengthOfStayAdGroupBidModifier =
      AdGroupBidModifier.newBuilder()
          // Sets the ad group.
          .setAdGroup(adGroupResourceName)
          // Creates the length of booking info.
          .setLengthOfBooking(
              LengthOfBookingInfo.newBuilder().setMinDays(3L).setMaxDays(7L).build())
          // Sets the bid modifier value to 170%.
          .setBidModifier(1.7d)
          .build();
  operations.add(
      AdGroupBidModifierOperation.newBuilder().setCreate(lengthOfStayAdGroupBidModifier).build());

  // Issues a mutate request to add the ad group bid modifiers.
  try (AdGroupBidModifierServiceClient adGroupBidModifierServiceClient =
      googleAdsClient.getLatestVersion().createAdGroupBidModifierServiceClient()) {
    MutateAdGroupBidModifiersResponse response =
        adGroupBidModifierServiceClient.mutateAdGroupBidModifiers(
            Long.toString(customerId), operations);

    // Prints the resource names of the added ad group bid modifiers.
    System.out.printf("Added %d hotel ad group bid modifiers:%n", response.getResultsCount());
    for (MutateAdGroupBidModifierResult mutateAdGroupBidModifierResult :
        response.getResultsList()) {
      System.out.printf("  %s%n", mutateAdGroupBidModifierResult.getResourceName());
    }
  }
}
AddHotelAdGroupBidModifiers.java
      

C#

public void Run(GoogleAdsClient client, long customerId, long adGroupId)
{
    // Get the AdGroupBidModifierService.
    AdGroupBidModifierServiceClient service = client.GetService(
        Services.V26.AdGroupBidModifierService);

    // Constructs the ad group resource name to use for each bid modifier.
    string adGroupResourceName = ResourceNames.AdGroup(customerId, adGroupId);

    // 1) Create an ad group bid modifier based on the hotel check-in day.
    AdGroupBidModifier checkInDayAdGroupBidModifier = new AdGroupBidModifier()
    {
        // Sets the resource name to the ad group resource name joined with the criterion
        // ID whose value corresponds to the desired check-in day.
        AdGroup = adGroupResourceName,
        StartDayOfWeek = new StartDayOfWeekInfo()
        {
            DayOfWeek = DayOfWeek.Monday
        },

        // Set the bid modifier value to 150%.
        BidModifier = 1.5,
    };

    // Creates an ad group bid modifier operation.
    var checkInDayAdGroupBidModifierOperation = new AdGroupBidModifierOperation()
    {
        Create = checkInDayAdGroupBidModifier
    };

    // 2) Create an ad group bid modifier based on the hotel length of stay.
    AdGroupBidModifier lengthOfStayAdGroupBidModifier = new AdGroupBidModifier()
    {
        // Set the ad group.
        AdGroup = ResourceNames.AdGroup(customerId, adGroupId),

        // Set the length of booking info.
        LengthOfBooking = new LengthOfBookingInfo()
        {
            MinDays = 3,
            MaxDays = 7
        },

        // Set the bid modifier value to 170%.
        BidModifier = 1.7
    };

    // Create an ad group bid modifier operation.
    var lengthOfStayAdGroupBidModifierOperation = new AdGroupBidModifierOperation()
    {
        Create = lengthOfStayAdGroupBidModifier
    };

    try
    {
        // Issue a mutate request to add an ad group bid modifiers.
        MutateAdGroupBidModifiersResponse response = service.MutateAdGroupBidModifiers(
            customerId.ToString(),
            new AdGroupBidModifierOperation[] {
      checkInDayAdGroupBidModifierOperation,
      lengthOfStayAdGroupBidModifierOperation
            }
        );

        // Display the resource names of the added ad group bid modifiers.
        Console.WriteLine($"Added {response.Results.Count} hotel ad group bid modifiers:");

        foreach (MutateAdGroupBidModifierResult result in response.Results)
        {
            Console.WriteLine($"- {result.ResourceName}");
        }
    }
    catch (GoogleAdsException e)
    {
        Console.WriteLine("Failure:");
        Console.WriteLine($"Message: {e.Message}");
        Console.WriteLine($"Failure: {e.Failure}");
        Console.WriteLine($"Request ID: {e.RequestId}");
        throw;
    }
}
AddHotelAdGroupBidModifiers.cs
      

PHP

    public static function runExample(
        GoogleAdsClient $googleAdsClient,
        int $customerId,
        int $adGroupId
    ) {
        $operations = [];

        // 1) Creates an ad group bid modifier based on the hotel check-in day.
        $checkInDayAdGroupBidModifier = new AdGroupBidModifier(
            [
            // Sets the ad group.
            'ad_group' => ResourceNames::forAdGroup($customerId, $adGroupId),
            'hotel_check_in_day' => new HotelCheckInDayInfo(
                [
                'day_of_week' => DayOfWeek::MONDAY
                ]
            ),
            // Sets the bid modifier value to 150%.
            'bid_modifier' => 1.5
            ]
        );

        // Creates an ad group bid modifier operation.
        $checkInDayAdGroupBidModifierOperation = new AdGroupBidModifierOperation();
        $checkInDayAdGroupBidModifierOperation->setCreate($checkInDayAdGroupBidModifier);
        $operations[] = $checkInDayAdGroupBidModifierOperation;

        // 2) Creates an ad group bid modifier based on the hotel length of stay.
        $lengthOfStayAdGroupBidModifier = new AdGroupBidModifier(
            [
            // Sets the ad group.
            'ad_group' => ResourceNames::forAdGroup($customerId, $adGroupId),
            // Creates the hotel length of stay info.
            'hotel_length_of_stay' => new HotelLengthOfStayInfo(
                [
                'min_nights' => 3,
                'max_nights' => 7,
                ]
            ),
            // Sets the bid modifier value to 170%.
            'bid_modifier' => 1.7
            ]
        );

        // Creates an ad group bid modifier operation.
        $lengthOfStayAdGroupBidModifierOperation = new AdGroupBidModifierOperation();
        $lengthOfStayAdGroupBidModifierOperation->setCreate(
            $lengthOfStayAdGroupBidModifier
        );
        $operations[] = $lengthOfStayAdGroupBidModifierOperation;

        // Issues a mutate request to add an ad group bid modifiers.
        $adGroupBidModifierServiceClient = $googleAdsClient->getAdGroupBidModifierServiceClient();
        $response = $adGroupBidModifierServiceClient->mutateAdGroupBidModifiers(
            MutateAdGroupBidModifiersRequest::build($customerId, $operations)
        );

        // Print out resource names of the added ad group bid modifiers.
        printf(
            "Added %d hotel ad group bid modifiers:%s",
            $response->getResults()->count(),
            PHP_EOL
        );
        foreach ($response->getResults() as $addedAdGroupBidModifier) {
            /**
 * @var AdGroupBidModifier $addedAdGroupBidModifier
*/
            print $addedAdGroupBidModifier->getResourceName() . PHP_EOL;
        }
    }
AddHotelAdGroupBidModifiers.php
      

Python

def main(client: GoogleAdsClient, customer_id: str, ad_group_id: str) -> None:
    ad_group_service: AdGroupServiceClient = client.get_service(
        "AdGroupService"
    )
    ag_bm_service: AdGroupBidModifierServiceClient = client.get_service(
        "AdGroupBidModifierService"
    )

    # Create ad group bid modifier based on hotel check-in day.
    check_in_ag_bm_operation: AdGroupBidModifierOperation = client.get_type(
        "AdGroupBidModifierOperation"
    )
    check_in_ag_bid_modifier: AdGroupBidModifier = (
        check_in_ag_bm_operation.create
    )
    check_in_ag_bid_modifier.hotel_check_in_day.day_of_week = (
        client.enums.DayOfWeekEnum.MONDAY
    )
    check_in_ag_bid_modifier.ad_group = ad_group_service.ad_group_path(
        customer_id, ad_group_id
    )
    # Sets the bid modifier value to 150%.
    check_in_ag_bid_modifier.bid_modifier = 1.5

    # Create ad group bid modifier based on hotel length of stay info.
    los_ag_bm_operation: AdGroupBidModifierOperation = client.get_type(
        "AdGroupBidModifierOperation"
    )
    los_ag_bid_modifier: AdGroupBidModifier = los_ag_bm_operation.create
    los_ag_bid_modifier.ad_group = ad_group_service.ad_group_path(
        customer_id, ad_group_id
    )
    # Creates the hotel length of stay info.
    hotel_length_of_stay_info: HotelLengthOfStayInfo = (
        los_ag_bid_modifier.hotel_length_of_stay
    )
    hotel_length_of_stay_info.min_nights = 3
    hotel_length_of_stay_info.max_nights = 7
    # Sets the bid modifier value to 170%.
    los_ag_bid_modifier.bid_modifier = 1.7

    # Add the bid modifiers
    ag_bm_response: MutateAdGroupBidModifiersResponse = (
        ag_bm_service.mutate_ad_group_bid_modifiers(
            customer_id=customer_id,
            operations=[check_in_ag_bm_operation, los_ag_bm_operation],
        )
    )

    # Print out resource names of the added ad group bid modifiers.
    print(f"Added {len(ag_bm_response.results)} hotel ad group bid modifiers:")

    result: MutateAdGroupBidModifierResult
    for result in ag_bm_response.results:
        print(result.resource_name)
add_hotel_ad_group_bid_modifiers.py
      

Ruby

def add_hotel_ad_group_bid_modifiers(customer_id, ad_group_id)
  # GoogleAdsClient will read a config file from
  # ENV['HOME']/google_ads_config.rb when called without parameters
  client = Google::Ads::GoogleAds::GoogleAdsClient.new
  operations = []
  ad_group_resource = client.path.ad_group(customer_id, ad_group_id)

  # 1) Creates an ad group bid modifier based on the check-in day.
  operations << client.operation.create_resource.ad_group_bid_modifier do |bm|
    # Sets the ad group.
    bm.ad_group = ad_group_resource

    # Sets the check-in day to Monday.
    bm.start_day_of_week = client.resource.start_day_of_week_info do |info|
      info.day_of_week = :MONDAY
    end

    # Sets the bid modifier value to 150%.
    bm.bid_modifier = 1.5
  end

  # 2) Creates an ad group bid modifier based on the length of booking.
  operations << client.operation.create_resource.ad_group_bid_modifier do |bm|
    # Sets the ad group.
    bm.ad_group = ad_group_resource

    # Creates the length of booking info.
    bm.length_of_booking = client.resource.length_of_booking_info do |info|
      info.min_days = 3
      info.max_days = 7
    end

    # Sets the bid modifier value to 170%.
    bm.bid_modifier = 1.7
  end

  # 3) Issues a mutate request to add an ad group bid modifiers.
  ad_group_bid_modifier_service = client.service.ad_group_bid_modifier
  response = ad_group_bid_modifier_service.mutate_ad_group_bid_modifiers(
    customer_id: customer_id,
    operations: operations,
  )

  # Print out resource names of the added ad group bid modifiers.
  puts "Added #{response.results.size} hotel ad group bid modifiers:"
  response.results.each do |added_ad_group_bid_modifier|
    puts "\t#{added_ad_group_bid_modifier.resource_name}"
  end
end
add_hotel_ad_group_bid_modifiers.rb
      

Perl

sub add_hotel_ad_group_bid_modifiers {
  my ($api_client, $customer_id, $ad_group_id) = @_;

  # 1) Create an ad group bid modifier based on the hotel check-in day.
  my $check_in_day_ad_group_bid_modifier =
    Google::Ads::GoogleAds::V26::Resources::AdGroupBidModifier->new({
      # Set the ad group.
      adGroup => Google::Ads::GoogleAds::V26::Utils::ResourceNames::ad_group(
        $customer_id, $ad_group_id
      ),
      hotelCheckInDay =>
        Google::Ads::GoogleAds::V26::Common::HotelCheckInDayInfo->new({
          dayOfWeek => MONDAY
        }
        ),
      # Set the bid modifier value to 150%.
      bidModifier => 1.5
    });

  # Create an ad group bid modifier operation.
  my $check_in_day_ad_group_bid_modifier_operation =
    Google::Ads::GoogleAds::V26::Services::AdGroupBidModifierService::AdGroupBidModifierOperation
    ->new({
      create => $check_in_day_ad_group_bid_modifier
    });

  # 2) Create an ad group bid modifier based on the hotel length of stay.
  my $length_of_stay_ad_group_bid_modifier =
    Google::Ads::GoogleAds::V26::Resources::AdGroupBidModifier->new({
      # Set the ad group.
      adGroup => Google::Ads::GoogleAds::V26::Utils::ResourceNames::ad_group(
        $customer_id, $ad_group_id
      ),
      # Create the hotel length of stay info.
      hotelLengthOfStay =>
        Google::Ads::GoogleAds::V26::Common::HotelLengthOfStayInfo->new({
          minNights => 3,
          maxNights => 7
        }
        ),
      # Set the bid modifier value to 170%.
      bidModifier => 1.7
    });

  # Create an ad group bid modifier operation.
  my $length_of_stay_ad_group_bid_modifier_operation =
    Google::Ads::GoogleAds::V26::Services::AdGroupBidModifierService::AdGroupBidModifierOperation
    ->new({
      create => $length_of_stay_ad_group_bid_modifier
    });

  # 3) Add the ad group bid modifiers.
  my $ad_group_bid_modifiers_response =
    $api_client->AdGroupBidModifierService()->mutate({
      customerId => $customer_id,
      operations => [
        $check_in_day_ad_group_bid_modifier_operation,
        $length_of_stay_ad_group_bid_modifier_operation
      ]});

  # Print out resource names of the added ad group bid modifiers.
  my $ad_group_bid_modifier_results =
    $ad_group_bid_modifiers_response->{results};
  printf "Added %d hotel ad group bid modifiers:\n",
    scalar @$ad_group_bid_modifier_results;

  foreach my $ad_group_bid_modifier_result (@$ad_group_bid_modifier_results) {
    printf "\t%s\n", $ad_group_bid_modifier_result->{resourceName};
  }

  return 1;
}
add_hotel_ad_group_bid_modifiers.pl
      

curl

Note: While a direct REST code sample for this step isn't provided here, you can achieve this using a manual REST request.

Refer to the Google Ads API REST interface documentation and the method-specific reference pages. You will need to construct the JSON payload based on the proto definitions.

Key Resources:

• Using REST
• REST Interface Structure
• JSON Field Mappings
• Consult the REST API Reference for the specific service and method.

Examples

The following examples show how to query, create, update, and remove ad group bid modifiers using GAQL and REST JSON payloads.

Reading bid modifiers with GAQL

The following queries illustrate retrieving length of booking bid modifiers in v25 and earlier compared to v26 and later:

v25 and earlier:

SELECT
  ad_group_bid_modifier.resource_name,
  ad_group_bid_modifier.bid_modifier,
  ad_group_bid_modifier.hotel_length_of_stay.min_nights,
  ad_group_bid_modifier.hotel_length_of_stay.max_nights
FROM ad_group_bid_modifier
WHERE ad_group_bid_modifier.hotel_length_of_stay.min_nights = 5

v26 and later:

SELECT
  ad_group_bid_modifier.resource_name,
  ad_group_bid_modifier.bid_modifier,
  ad_group_bid_modifier.length_of_booking.min_days,
  ad_group_bid_modifier.length_of_booking.max_days
FROM ad_group_bid_modifier
WHERE ad_group_bid_modifier.length_of_booking.min_days = 5

Creating bid modifiers (JSON payload)

The following JSON payloads demonstrate creating ad group bid modifiers in v26 and later.

Creating a length of booking bid modifier in v26:

{
  "customerId": "1234567890",
  "operations": [
    {
      "create": {
        "adGroup": "customers/1234567890/adGroups/987654321",
        "bidModifier": 1.2,
        "lengthOfBooking": {
          "minDays": "3",
          "maxDays": "5"
        }
      }
    }
  ]
}

In v25 and earlier, this used hotelLengthOfStay with minNights and maxNights.

Creating a start date range bid modifier in v26:

{
  "customerId": "1234567890",
  "operations": [
    {
      "create": {
        "adGroup": "customers/1234567890/adGroups/987654321",
        "bidModifier": 1.5,
        "startDateRange": {
          "startDate": "2026-12-20",
          "endDate": "2026-12-31"
        }
      }
    }
  ]
}

Creating a user set dates bid modifier in v26:

{
  "customerId": "1234567890",
  "operations": [
    {
      "create": {
        "adGroup": "customers/1234567890/adGroups/987654321",
        "bidModifier": 1.3,
        "userSetDates": {
          "type": "USER_SELECTED"
        }
      }
    }
  ]
}

Updating and removing bid modifiers

You can update the multiplier on an existing bid modifier or remove the bid modifier entirely:

• Updating: Criterion fields are IMMUTABLE. To modify the bid multiplier, send an update operation with updateMask (update_mask in protobuf) set to "bidModifier" ("bid_modifier") and set bidModifier (bid_modifier) to a valid value (0.1 to 10.0 or 0 to opt out for advance_booking_window, length_of_booking, start_day_of_week, start_date_range, and device; 0.5 to 2.0 for user_set_dates). To change the targeting criteria, remove the bid modifier and create a new one.
• Removing: Send a remove operation with the resource name:

{
  "customerId": "1234567890",
  "operations": [
    {
      "remove": "customers/1234567890/adGroupBidModifiers/987654321~555444333"
    }
  ]
}

Validation rules and error handling

Validation rules stay the same across versions, but six CriterionError enum values are renamed in v26 as shown in the following table:

Scenario	v25 and earlier	v26 and later
Length of booking range overlaps existing criterion	HOTEL_LENGTH_OF_STAY_OVERLAPS_WITH_EXISTING_CRITERION	LENGTH_OF_BOOKING_OVERLAPS_WITH_EXISTING_CRITERION
Advance booking window range overlaps existing criterion	HOTEL_ADVANCE_BOOKING_WINDOW_OVERLAPS_WITH_EXISTING_CRITERION	ADVANCE_BOOKING_WINDOW_OVERLAPS_WITH_EXISTING_CRITERION
Start date range overlaps existing criterion	HOTEL_CHECK_IN_DATE_RANGE_OVERLAPS_WITH_EXISTING_CRITERION	START_DATE_RANGE_OVERLAPS_WITH_EXISTING_CRITERION
start_date earlier than yesterday (UTC)	HOTEL_CHECK_IN_DATE_RANGE_START_DATE_TOO_EARLY	START_DATE_RANGE_START_DATE_TOO_EARLY
end_date more than 330 days in future (UTC)	HOTEL_CHECK_IN_DATE_RANGE_END_DATE_TOO_LATE	START_DATE_RANGE_END_DATE_TOO_LATE
start_date after end_date	HOTEL_CHECK_IN_DATE_RANGE_REVERSED	START_DATE_RANGE_REVERSED

The following validation errors apply across all API versions:

• FieldError.REQUIRED: Missing a required range bound (such as advance_booking_window without min_days or max_days).
• RangeError.TOO_HIGH / RangeError.TOO_LOW: Value out of bounds, such as advance_booking_window.max_days greater than 330, min_days greater than max_days on advance_booking_window or length_of_booking, bid_modifier outside 0.1–10.0 for advance_booking_window, length_of_booking, start_day_of_week, or start_date_range, or bid_modifier outside 0.5–2.0 (including 0) for user_set_dates.
• ResourceCountLimitExceededError.RESOURCE_LIMIT: Ad group exceeds the per-ad-group limit for bid modifiers.
• MutateError.INCONSISTENT_FIELD_VALUES: A fixed-ID enum subfield (such as user_set_dates.type, start_day_of_week.day_of_week, or device.type) does not match the criterion ID specified in resource_name.
• ContextError.OPERATION_NOT_PERMITTED_FOR_CONTEXT: Attempting to add a travel bid modifier on an unsupported campaign type or ineligible Search campaign.