Oliveira,
Could you explain more detail for option1? In the above example, since there are 4 accounts and 4 brands, after the expansion, it will generate 16 rows since every outer dimension will loop for all the 4 inner dimension brand, but actually he only need 1 rows for each account, in BPC 7.5 we can achieve this easily by disable the row expansion, but I am not sure how we can get the same in BPC10.0.