I'm trying to figure out a way to allow the end user to change the field that is displayed on the dashboard, data is coming from a SSAS cube. I've done this with relational data sources by following the steps here: http://kb.tableausoftware.com/articles/knowledgebase/parameterized-measure. Any suggestions are appreciated.
I created a parameter with the measures listed, then created a calculated field with this code:
Case [Choose Type]
When "Projection" Then [Land Sales Revenue - Projection]
When "Actual" Then [Land Sales Revenue - Actual]
Display the parameter control and that should work for you! Is this what you were looking for?