Hi Durai,

I recreated but still not working, let me just recapitulate to se if I didn't left nothing out that might help on the solution for this issue:

Purpose of report: comparing current results against last result 3 months ago

Nbr of datasets: two datasets

Nbr of parameters: one (each month is represented by a integer number, for example July, 2013 is 273)

How to: The intention is to have the parameter mapped to one of the datasets changed through an expression (=Parameters!Period.Value -3) the other dataset will have the parameter mapping unchanged (=Parameters!Period.Value)

Best regards,

Daniel