YTD issue in Management Reporter 2 0

I want to build an Income Statement for the current month (March for example), current YTD versus same month prior yeat and prior YTD. If I enter YTD into Periods covered then I get the number that looks more like entire YTD and not just Jan+Feb+Mar. For the rpior year I entered YTD-1 and for the same month prior year BASE-1

On the Report definition Base Period is 3 and Base Year 2011.

So what is the issue with YTD and prior YTD?

Please advise