deleting data from an Pass Thru ODS

During the BI-congress in Dusseldorf (Germany) in 2005, BW 7.0 was presented. During one of these presentation it was told that the ODS should get the pass-thru function. This means that you can load data in an ODS, pass it to the next ODS and delete the data. Does anybody know how this is working, without doing a new initialization?