In one worksheet, to display the measure value (Sales) of Last 12 Months(LTM) and Previous 12 Months(PTM) from the selected month.
Current Month is 2018-June , By default selection
PTM date range for the sales period as (2016-June to 2017-May) LTM date range for the sales period as (2017-June to 2018-May)
If user selects different month from the drop down, let's select (Apr 2018)
PTM date range as (2016-Apr to 2017-Mar) LTM date range as (2017-Apr to 2018-Mar)