Set analysis for 2 field comparativ whit 10 distinct value

[cristianmaftei]

I must present a calculated value between 2 columns for each last day of the week of this year
In the pivot table:  dimension are the following days: 06/01/2019, 13/01/2019, 20/01/2019, 27/01/2019 .....,
 and the measure: value of sale - value of collection

thank you in advance