Instead of using a singleton, try using a single query with the following query items:
Country,Shop,Date,AVG,MAX,Data item
Filter -> date in (?Date1?,?Date2?)
Build the crosstab, then create a calculation for the difference using running difference:
[u...
Country,Shop,Date,AVG,MAX,Data item
Filter -> date in (?Date1?,?Date2?)
Build the crosstab, then create a calculation for the difference using running difference:
[u...