I created the following variable and used it in the set analysis expression. The issue is that when I select a date in the Year-Month dimension, I am not getting any results as expected. The expression is supposed to sum all payment amounts for all previous periods from the date selected in the Year-Month field. The variable in the expression turns "active" when I remove the " " but, the result is null. When I include the " ", the variable turns to plain text and the result is 0.00. I tested the results of the variable to the values in the Year-Month field and they match (i.e. 2018-Jun to 2018-Jun). I know I'm close but don't see where I'm not correct.