11.6 Restrictions in Using Custom Elements and Values
Extensions MUST only be used with Master Reports and custom reports, they MUST NOT be used with Standard Views. Note, however, that a report with extensions that is similar to a Standard View can be created by applying the Standard View’s filters and attributes to the corresponding Master Report and adding the extensions.
Custom elements and values MUST only be included in Master Reports if requested. So for reports requested via the COUNTER_SUSHI API, custom elements MUST only be included if requested via attributes_to_show, and custom values MUST only be included if requested via the corresponding report filters (e.g. metric_type or data_type). On the administrative/reporting site the custom elements and values can be preselected for Master Reports, but the user MUST have the option to exclude the custom elements and values from the Master Reports.