**Service** [AdRuleService](https://developers.google.com/ad-manager/api/reference/v202605/AdRuleService.RequiredCollectionError.Reason) [AdjustmentService](https://developers.google.com/ad-manager/api/reference/v202605/AdjustmentService.RequiredCollectionError.Reason) [AdsTxtService](https://developers.google.com/ad-manager/api/reference/v202605/AdsTxtService.RequiredCollectionError.Reason) [AudienceSegmentService](https://developers.google.com/ad-manager/api/reference/v202605/AudienceSegmentService.RequiredCollectionError.Reason) [CdnConfigurationService](https://developers.google.com/ad-manager/api/reference/v202605/CdnConfigurationService.RequiredCollectionError.Reason) [CmsMetadataService](https://developers.google.com/ad-manager/api/reference/v202605/CmsMetadataService.RequiredCollectionError.Reason) [CompanyService](https://developers.google.com/ad-manager/api/reference/v202605/CompanyService.RequiredCollectionError.Reason) [ContactService](https://developers.google.com/ad-manager/api/reference/v202605/ContactService.RequiredCollectionError.Reason) [ContentBundleService](https://developers.google.com/ad-manager/api/reference/v202605/ContentBundleService.RequiredCollectionError.Reason) [ContentService](https://developers.google.com/ad-manager/api/reference/v202605/ContentService.RequiredCollectionError.Reason) [CreativeService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeService.RequiredCollectionError.Reason) [CreativeSetService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeSetService.RequiredCollectionError.Reason) [CreativeTemplateService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeTemplateService.RequiredCollectionError.Reason) [CreativeWrapperService](https://developers.google.com/ad-manager/api/reference/v202605/CreativeWrapperService.RequiredCollectionError.Reason) **CustomFieldService** [CustomTargetingService](https://developers.google.com/ad-manager/api/reference/v202605/CustomTargetingService.RequiredCollectionError.Reason) [DaiAuthenticationKeyService](https://developers.google.com/ad-manager/api/reference/v202605/DaiAuthenticationKeyService.RequiredCollectionError.Reason) [DaiEncodingProfileService](https://developers.google.com/ad-manager/api/reference/v202605/DaiEncodingProfileService.RequiredCollectionError.Reason) [ForecastService](https://developers.google.com/ad-manager/api/reference/v202605/ForecastService.RequiredCollectionError.Reason) [InventoryService](https://developers.google.com/ad-manager/api/reference/v202605/InventoryService.RequiredCollectionError.Reason) [LabelService](https://developers.google.com/ad-manager/api/reference/v202605/LabelService.RequiredCollectionError.Reason) [LineItemCreativeAssociationService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemCreativeAssociationService.RequiredCollectionError.Reason) [LineItemService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemService.RequiredCollectionError.Reason) [LineItemTemplateService](https://developers.google.com/ad-manager/api/reference/v202605/LineItemTemplateService.RequiredCollectionError.Reason) [LiveStreamEventService](https://developers.google.com/ad-manager/api/reference/v202605/LiveStreamEventService.RequiredCollectionError.Reason) [MobileApplicationService](https://developers.google.com/ad-manager/api/reference/v202605/MobileApplicationService.RequiredCollectionError.Reason) [NativeStyleService](https://developers.google.com/ad-manager/api/reference/v202605/NativeStyleService.RequiredCollectionError.Reason) [NetworkService](https://developers.google.com/ad-manager/api/reference/v202605/NetworkService.RequiredCollectionError.Reason) [OrderService](https://developers.google.com/ad-manager/api/reference/v202605/OrderService.RequiredCollectionError.Reason) [PlacementService](https://developers.google.com/ad-manager/api/reference/v202605/PlacementService.RequiredCollectionError.Reason) [ProposalLineItemService](https://developers.google.com/ad-manager/api/reference/v202605/ProposalLineItemService.RequiredCollectionError.Reason) [ProposalService](https://developers.google.com/ad-manager/api/reference/v202605/ProposalService.RequiredCollectionError.Reason) [PublisherQueryLanguageService](https://developers.google.com/ad-manager/api/reference/v202605/PublisherQueryLanguageService.RequiredCollectionError.Reason) [ReportService](https://developers.google.com/ad-manager/api/reference/v202605/ReportService.RequiredCollectionError.Reason) [SegmentPopulationService](https://developers.google.com/ad-manager/api/reference/v202605/SegmentPopulationService.RequiredCollectionError.Reason) [SiteService](https://developers.google.com/ad-manager/api/reference/v202605/SiteService.RequiredCollectionError.Reason) [StreamActivityMonitorService](https://developers.google.com/ad-manager/api/reference/v202605/StreamActivityMonitorService.RequiredCollectionError.Reason) [SuggestedAdUnitService](https://developers.google.com/ad-manager/api/reference/v202605/SuggestedAdUnitService.RequiredCollectionError.Reason) [TargetingPresetService](https://developers.google.com/ad-manager/api/reference/v202605/TargetingPresetService.RequiredCollectionError.Reason) [TeamService](https://developers.google.com/ad-manager/api/reference/v202605/TeamService.RequiredCollectionError.Reason) [UserService](https://developers.google.com/ad-manager/api/reference/v202605/UserService.RequiredCollectionError.Reason) [UserTeamAssociationService](https://developers.google.com/ad-manager/api/reference/v202605/UserTeamAssociationService.RequiredCollectionError.Reason) [YieldGroupService](https://developers.google.com/ad-manager/api/reference/v202605/YieldGroupService.RequiredCollectionError.Reason) **Dependencies** [RequiredCollectionError](https://developers.google.com/ad-manager/api/reference/v202605/CustomFieldService.RequiredCollectionError) ▼ **RequiredCollectionError.Reason**

*** ** * ** ***

Namespace
:
    `https://www.google.com/apis/ads/publisher/v202605`

| Enumeration | Description |
|---|---|
| `REQUIRED` | A required collection is missing. |
| `TOO_LARGE` | Collection size is too large. |
| `TOO_SMALL` | Collection size is too small. |
| `UNKNOWN` | The value returned if the actual value is not exposed by the requested API version. |