Re: Pivot Table - Change Expression titles - labels - by expression value
I believe the label expression is just not sensitive to Measurement#, i.e. the current dimension values.
If you pivot your second dimension to the left, you will also see a reason why: What label should be displayed?
You may be able to achieve something similar than what you intend to do now by creating an additional dimension that holds your expression labels, and then use one expression with a pick / match combination to select the expression needed.