Applying complex logic while loading transactional data from SAP BW

Hello,

currently our approach to more complex logic while loading transactionals from SAP BW, is applying this logic in a transformation in SAP BW - hence pre-transforming the data in a BPC format in BW.

What are now the possibilities to apply more complex logic while loading transactionals from BW with a package (in version 10) - so we don't need to pretransform the data ? Is it workeable with BADI's ? Script logic can only be applied on data already in the BPC models, so that might not be workeable.