OLAP tool convert to formula not returnin same number as in Pivot

Question

hi everyone,

I have a SASS cube conected to a PowerPivot and I use the OLAP tool to convert to formulas.
I have a field in SOLD PARENT ACCOUNT where I have 40 retail stores and I am filtering to get only the sum of 2 of all the stores.
The pivot gives me the right total for my measure but when I use OLAP get the formula for only these 2 stores I get the sales total of the 40 of them.
It seems as if the convert to formula function is ignoring my filter.
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any idea what's the problem and how to fix it?