It appears to me that you are trying to create a sort key based on a fiscal calendar.
In which case I have to ask why the fiscal month is not in your time dimension. You might want it to include the year - or have another item like [Fiscal Sort Key] - ...
In which case I have to ask why the fiscal month is not in your time dimension. You might want it to include the year - or have another item like [Fiscal Sort Key] - ...