Report Generator

I started looking at the Report Generator (YARG). From the documentation, it seems that reporting can only be done on CUBA entities. Is that true?
I have an external accounting system and what I would like to do is query that external system to get the data and use it to generate reports. Is it possible?

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Actually, you can use different sources of data in YARG. The most common are : SQL/JPQL scripts, Groovy scritps, signle entity and list of entities, JSON objects. Also, you can implement and register your own type of data loader with specific logic.
If you want to do some queries to external system, with a complex logic, probably the best way is to use Groovy data loader.

You can see the example in YARG’s wiki