Problem in BO Universe connection with MDX layer and BW layer

Hi,

I have a Universe which was created on top of BEx query and have measure object using MDX syntax<expression></expression>. However, while creating Webi report in BO 4.1, if i manually create Prompt filter in dataprovider, the filter doesn't get applied on the MDX measure object. But instead of creating prompt filter in dp, if i refresh report without dataprovider filter and apply drill filter, at that time the Measure object works fine. I have doubt on MDX interface, i guess Webi dataprovider filter doesn't hit to MDX layer.