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The compatibility issue you are facing is due to the nature of GA4’s data model which is event-based, compared to the session-based model of Universal Analytics. This affects the ability to mix dimensions and metrics like you were able to do in GA3. Specifically, the issue arises when trying to mix event-scoped dimensions (like itemId and itemName) and user-scoped dimensions (like source). Workarounds may involve creating custom dimensions in GA4, or modifying your approach to collecting and analyzing data, keeping in mind the event-based structure of GA4. Additional requests to GA4 API might be unavoidable due to the change in data model structure.
