CY vs PY Comparison in Line chart

[balasundaram]

I want to show Details Of CY and PY in single report..

based on Year and Month.

For example..if i selected Current Year and May month...same chart need to display Previous Year and Previous year may month..

[senpradip007]

Create a variable vPrevYear = Max(Year) - 1

Use these two expressions

Sum({<Year={$(=Max(Year))}, Month={$(=Max(Month))}>} [Your Field])

Sum({<Year={$(vPrevYear)}, Month={$(=Max(Month))}>} [Your Field])