URL parameter value SSRS

Hi Experts,

I would like to pass one report URL from main report like drill through report. 

It written expression in the ACTIONS and is working fine but it can't able to pass the value.

Below is my expression 

=Replace(Globals!ReportServerUrl,"ReportServer","Reports/Pages/Report.aspx?ItemPath=%2fBCC+Reporting%2fLand+Services%2fTask+Analysis%2fTA01_Task_Details"& "&Item_Number="&Fields!ItemNumber.Value)

Can anyone guide me where I was doing mistake 

Thanks,

RK