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You can't use LOD when you use data blend.
zz is correct - you can't write an LOD across blended data sources - can the sources be connected in a join or a union
if you attach a sample workbook with representative data the show your data structure and also the individual data files it would help us help you
Thanks zz, I appreciate your help.
Thank you Jim for your feedback. I thought I did join the data, but must have done something wrong afterwards. Is there any way to tell whether the data is "blended" vs. "joined" together?
this shows there are 2 separate data sources that have be blended
on the data source tab this would indicate that you Joined the data
and this would indicate you unioned the data (appended)
see the link Tableau Training: View Training Courses
and the section below to learn how to connect data in the different manners
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