Have you had any responses to this yet?
Can I please bump this post up? Any responses anyone?
Thanks in advance!
I am having exactly the same issue. Did you find a solution for this?
This is a known issue with data blending. The error is generally known to be triggered by a chain of nested equations which reference different secondary data sources. Although, I'm not sure why it would work when you duplicate the calculated field.
I might recommend adding nested calculations to the Ideas section!