Using restricted Key figures for other calculations in IDT

Hi Experts,

I have created restricted key figures in  IDT and i want to have sum of those in third key figure.

Key figure1:
select:Sales
where: Country='UK'

Key figure2:
select:Profit
where: Country='USA'

Key figure3: (Required)
@Select(Measures\Key  figure1)+@Select(Measures\Key figure2)

in key figure 3 its summing up  the whole amount and its not considering @where caluse of key figure 1 and key  figure 2.

I am just concerned how this can be achived in IDT , what am i  doing wrong and do i have to create them in data foundation?
please help.

Thanks,

Haseeb