ABAP for query data with hierarcy

Hi,

I'm working on producing data for regulatory reports with specific format & coding structure. This has to be done with ABAP. The bigger challenge is that the some data are derived via hierarchy (e.g. parent node value is total of child nodes) that should be realized/performed via BEx Analyzer (BW Query). I wonder whether there is a function module to extract data from a BW query, otherwise have to apply the calculation logics in the program.

Thanks for sharing.

Regards,

Augustine