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I'm developing a custom visual using matrix dataViewMappings.
My problem is that I only get the Subtotal values if I package the visual and import it,
and this way I can't rely on these data while running the visual in development mode.
The detailed bug report is here, but I start to think that it's a bug of a different tool and not powerbi-visuals-tools:
https://github.com/microsoft/PowerBI-visuals-tools/issues/288
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