Update conditions in outbound delivery

Hi,

I need to update the conditions in an outbound delivery in batch.

I am getting the really charged freight from a third party software by file and i will take this file and have to update a outbound delivery in SAP.

Updating conditions in sales orders works very simple via BAPI_SALESORDER_CHANGE, but i think as conditions in outbound delivery were possible only since 4.5 its not so comfortable.

I tried many FBs but was not really satisfied with one.

Does anybody knows a good way (in the standard) to update conditions in an outbound delivery? (BAPI, FB, Method, ...)

Thanks a lot

Markus