AI-generated Key Takeaways
- 
          The EntityChildrenLimitReachedError indicates that a limit has been reached for the number of child entities allowed for a parent entity in the network. 
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          This error can occur for various entity types, including line items, creatives, ad units, targeting expressions, custom targeting values, proposals, products, and more. 
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          Specific reasons for the error are provided, such as exceeding the maximum number of line items on an order or the maximum number of creatives associated with a line item. 
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          The UNKNOWNreason is returned if the specific error value is not available in the requested API version.
The reasons for the entity children limit reached error.
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202502
| Enumeration | Description | 
|---|---|
| LINE_ITEM_LIMIT_FOR_ORDER_REACHED | The number of line items on the order exceeds the max number of line items allowed per order in the network. | 
| CREATIVE_ASSOCIATION_LIMIT_FOR_LINE_ITEM_REACHED | The number of creatives associated with the line item exceeds the max number of creatives allowed to be associated with a line item in the network. | 
| AD_UNIT_LIMIT_FOR_PLACEMENT_REACHED | The number of ad units on the placement exceeds the max number of ad units allowed per placement in the network. | 
| TARGETING_EXPRESSION_LIMIT_FOR_LINE_ITEM_REACHED | The number of targeting expressions on the line item exceeds the max number of targeting expressions allowed per line item in the network. | 
| TARGETING_EXPRESSION_SIZE_LIMIT_REACHED | The size of a single targeting expression tree exceeds the max size allowed by the network. | 
| CUSTOM_TARGETING_VALUES_FOR_KEY_LIMIT_REACHED | The number of custom targeting values for the free-form or predefined custom targeting key exceeds the max number allowed. | 
| TARGETING_EXPRESSION_LIMIT_FOR_CREATIVES_ON_LINE_ITEM_REACHED | The total number of targeting expressions on the creatives for the line item exceeds the max number allowed per line item in the network. | 
| ATTACHMENT_LIMIT_FOR_PROPOSAL_REACHED | The number of attachments added to the proposal exceeds the max number allowed per proposal in the network. | 
| PROPOSAL_LINE_ITEM_LIMIT_FOR_PROPOSAL_REACHED | The number of proposal line items on the proposal exceeds the max number allowed per proposal in the network. | 
| PRODUCT_LIMIT_FOR_PRODUCT_PACKAGE_REACHED | The number of product package items on the product package exceeds the max number allowed per product package in the network. | 
| PRODUCT_TEMPLATE_AND_PRODUCT_BASE_RATE_LIMIT_FOR_RATE_CARD_REACHED | The number of product template and product base rates on the rate card (including excluded product base rates) exceeds the max number allowed per rate card in the network. | 
| PRODUCT_PACKAGE_ITEM_BASE_RATE_LIMIT_FOR_RATE_CARD_REACHED | The number of product package item base rates on the rate card exceeds the max number allowed per rate card in the network. | 
| PREMIUM_LIMIT_FOR_RATE_CARD_REACHED | The number of premiums of the rate card exceeds the max number allowed per rate card in the network. | 
| AD_UNIT_LIMIT_FOR_AD_EXCLUSION_RULE_TARGETING_REACHED | The number of ad units on AdExclusionRule.inventoryTargetingexceeds the max number
                of ad units allowed per ad exclusion rule inventory targeting in the network. | 
| NATIVE_STYLE_LIMIT_FOR_NATIVE_AD_FORMAT_REACHED | The number of native styles under the native creative template exceeds the max number of native styles allowed per native creative template in the network. | 
| TARGETING_EXPRESSION_LIMIT_FOR_PRESENTATION_ASSIGNMENT_REACHED | The number of targeting expressions on the native style exceeds the max number of targeting expressions allowed per native style in the network. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |