Webi report on OLAP Bex query - Cost element Hierarchy not working Drill down

Hello,

We have a BO report on Bex query, Not on universe, we have a Hierarchy for Cost Element Group, and we are expecting the Drill down functionality for that in BO report, but it does not.

Webi report on OLAP Bex query -  Cost element Hierarchy not working Drill down

Any pointers how to do it please

Thanks

Krishna