What are the limits and requirements for inventory identifiers?
You can create up to 500 inventory identifiers per site, each with a unique name up to 60 characters. Each inventory identifier can represent presets for one, several, or all of the core parameters. For each inventory identifier, you can specify: • Up to 10 ad sizes, content topics, content types, custom content categories, custom sections, and reporting tags. • Only one ad delivery mode. To retrieve the list of targeting attribute types that are supported in an inventory identifier, use the getSupportedTargetingAttributeTypes operation.