set analysis variable Year Week

[#1]

  hi i would like to perform a point in time report.

i am currently trying to point back to the previous year and week based upon my selection.

my selection in this case is 201531 so i would like to return the values for 201431.

please see my attempt below

sum(<{[Year Week] = {$(=(Only(Year)-1)) & $(=Only(Week))}>}

Sales)

[Gysbert_Wassenaar]

Try sum(<{[Year Week] = {$(=(Only(Year)-1)),$(=Only(Week))}>} Sales)