Member Formulas

Hello,

We r  using  BPC 10.1 NW,  YTD model and using standard measures.

How the measures are applied to Member formulas? In below scenario periodic values for Acct3 doesn't match with what we are expecting.

Acct3(inc) = Acct1(exp)+acct2(ast)

when measures are applied , is it only to  acct3 or all 3 accts or is it applied only to acct1 & acct2?

Thanks in Advance,

Meghana