> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v23** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/PolicyTopicConstraint).

Describes the effect on serving that a policy topic entry will have.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v23/common/policy.proto)

| Fields ||
|---|---|
| ## `value` Union field. Specific information about the constraint. `value` can be only one of the following: ||
| ### `certificate_domain_mismatch_in_country_list` | `CountryConstraintList` Countries where the resource's domain is not covered by the certificates associated with it. |
| ### `certificate_missing_in_country_list` | `CountryConstraintList` Countries where a certificate is required for serving. |
| ### `country_constraint_list` | `CountryConstraintList` Countries where the resource cannot serve. |
| ### `reseller_constraint` | `ResellerConstraint` Reseller constraint. |