dashboard drill problem

Hi everybody,

i am trying to drill in my dasboard, here is the webi report( there is no problem in webi report about drill)

please note that prodline is merged dimension but i use only Query1.prodline.in my report.

and here is the drill test output; (drill down not working)

but , if i use get report block filter is working now.. why doesnt work in drill. any idea ? thanks.