Does the LastPeriods function have to be used with the Aggregate function when creating a KPI expression?
Aggregate({[Incident].[Incident].&[1]} *
{LastPeriods(4, [Date].[Year - Quarter].[Quarter].&[2006-01-01T00:00:00])},
[Measures].[TOTAL])
If so, is it better to just do:
Aggregate({[Incident].[Incident].&[1]} *
{[Date].[Year - Quarter].[Quarter].&[2005-01-01T00:00:00] : [Date].[Year - Quarter].[Quarter].&[2006-01-01T00:00:00]},
[Measures].[TOTAL])
Whether Aggregate() should be used depends on the definition of the KPI - what are the business rules for it?
Also, {[Date].[Year - Quarter].[Quarter].&[2005-01-01T00:00:00] : [Date].[Year - Quarter].[Quarter].&[2006-01-01T00:00:00]} is probably equivalent to LastPeriods(5, [Date].[Year - Quarter].[Quarter].&[2006-01-01T00:00:00]) - so should 4 or 5 quarters be included?
