Products AdWords API Guides enum SystemManagedEntitySource (v201809) Service AdGroupAdService AdService Dependencies Ad ▼ SystemManagedEntitySource Indicates the source of a system-generated entity. Namespace https://adwords.google.com/api/adwords/cm/v201809 Enumeration Description UNKNOWN AD_VARIATIONS Generated ad variations experiment ad. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated March 20, 2019.