Here’s an easy fix for you! This issue has come a couple times from customers, and I’ve seen several threads in the forums about this.  I’m hoping a blog post with the error in the title will help others find this easy solution if they run into this...

I was authoring some reports today and thought I would take a screenshot and jot down some notes for the SCOM community. This is only the model.  There is a lot more we can do inside the actual query to pull the data we need to build our report. ...