When you configure a Source transformation to read from a Google Analytics report, you can select the fields from the Fields tab in the transformation. The fields represent the metrics and dimensions of the Google Analytics report. To verify if the field is a metric or a dimension, click the following URL:
When you use Core Reporting API v3 or Analytics Reporting API v4, you need to include both dimensions and metrics. If you include only dimensions or only metrics in the Google Analytics report, the mapping fails. Ensure that you do not exceed 10 metrics and 7 dimensions in the Google Analytics report.
When you use Google Analytics 4 API, ensure that you do not exceed 10 metrics and 9 dimensions in the Google Analytics report.