Hi Geoff Koch
Are you using tableau 9. Refer this.
Understanding LOD Expressions: Understanding Level of Detail (LOD) Expressions | Tableau Software
Top 15 LOD Expressions
Mark Fraser will help you with lod.
I didn't see the answer in the resources you linked (although the Top 15 LOD Expressions is one I've favorited - thanks for that). Is it just not possible to use an LOD expression from a secondary data source via data blending?
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In version 9 you cannot perform an LoD calc on a secondary data source with data blending II. I'm double checking now regarding data blending I.
Thanks for the feedback. It is very much appreciated!