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I'm not sure about the tracks but you can build calculations conditioned to a parameter value.
Explaining a little bit better, your previous year would be null if parameter not selected.
Thanks. Will take a look and get back with any questions.
I tried mimicking it but no success. Obviously, i am not doing something right.
Can you please be so kind enough to give step by step instructions?
I was able to make it work with the bands as well. I had to put in custom reference lines using Distribution Bands as a base and percentiles for my band calculation.
thanks very much Luciano for the head start.
Can you share your twbx?