Hi Abhi,
What SP or FPs do you have installed on your XI 3.1? I see a few defects in a KBA search for XI 3.1 that have mostly been corrected by SP3.
But I don't see anything specific to just using the structure's details - except when used as a predefined filter in which case the filter itself is built incorrectly.
Does the structure dimension and it's details work as expected outside of WebI?
Thanks,
Carly