Transfer B2 data to BW

Hello,

We need to transfer the data stored in the B2 cluster to BW. We can extract the data from the B2 cluster pretty easily using function module HR_TIME_RESULTS_GET, put it in a flat file and import it in BW. However, I'd like to know if there is an other way to do it like using and IDOC (like OTTM) or a BAPI.

Thanks for your help.

Anthony