Essbase ASO - How to aggregate all Parents in multiple dimensions when using member formulas

Question

We are trying to add a few MDX member formulae on some of our Accounts in the ASO cube. We recently understood that member formulas in ASO calculate both LEVEL0 and Parent members of other dimensions, So we are trying to tell Essbase to calculate LEVEL0's only and to aggregate all other levels in all dimensions. However we are unable to get the syntax right. Below is what we so far have
AccA has below formula:
CASE WHEN ISLEVEL([Period].Currentmember,0)
THEN
AccX+AccY
WHEN ISLEVEL([Period].Currentmember,1) OR ...etc
THEN SUM({LEAVES([Period].Currentmember)},[AccA])
END
This does work fine and gives correct values for Parent members in Period dimension. But we also have 3 other dimensions like Product, Area and Entity. We tried the below but this throws an error during retrival.
CASE WHEN ISLEVEL([Period].Currentmember,0)
THEN AccX+AccY
WHEN ISLEVEL([Period].Currentmember,1) OR ...etc
THEN SUM({LEAVES([Period].Currentmember),LEAVES([Product].Currentmember)},[AccA])
END
Should we add multiple SUM commands in there? All we want to do is tell Essbase to aggregate all other dimensions to parent levels. Please help.

Answer 1

Sorry to reiterate the post again.
DanPressman Was wondering what would be other way to write calculations other than Accounts.
I have a case where the user wants to calculate Ending Equity and this should be calculated at level0 using the rates and all parents of entity has to aggregate.
1. Level0 of entities calculate with rates
2. aggregate its children to parent entity
I have used solve order to get it work but taking a lot of time.
Is there any other alternative way of doing it? Which other dimension i can choose to perform this calculation? This is exactly similar to productsum calculation