From the picture like below, material numbers could be repeated over the years. in KPI I want to pick out the new field value first time appeared in certain period, say, 2018, as well as the counterpart of LYTD, I have wrote the expressions like following which works.
The question is: if to see the counts of first time appeared new materials also in other period, with existing year and month filter selection button, I only can see all materials intead of new materials. so is it possible to create a customized button with condition of year, month, which enable me to see also the counts results of only initial appeared materials in defined period? how can I make this possibly?