Currency conversion and Refrence dimension

Hi Expert,

Quick question...

1) Is it compulsory to reference Account Dimension of Consolidation application with R_Account dimension of Rate Application for the working of currency conversion or whether we can do currency conversion without referencing both the dimension.

2) If I do the reference of the ACCOUNT with R_ACCOUNT then whatever property value I give in RATETYPE property of ACCOUNT is to be maintained as member within R_ACCOUNT is that correct?