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You conclusion does not sound correct to me. But we're going to need to see your setup to be able to figure out what's going on.
Hi Shawn. Thanks for the reply. So, after further testing, etc. I did find the root cause. The error message is very unclear. However, it had to do with how I set up my aggregations. Once I fixed that, the error message went away. In short, Tableau DOES support mixing metrics from 2 different secondary data sources.