Hi,
As our fellow mates(ramanjaneyulu & Arminder) suggested best approach one more thing i would like to add here if you are on BW 7.30 version then no need to use APD to populate data from report to cube.
there is new feature in 730 you can use BW report as source for any data-targets (DSO or Cube) in your modeling.
Regards,
Harish