Hi,
using the MSEG table create the generic data soruce with table/view funciton.
select the required objects form the MSEG and replicate the data soruce form ECC to BW
after create the DSO/CUBE according to your requirments.
you can calcualte the value Quantity in Stock and Quantity in Transit in query designer level.
let me know have any issues.
Thanks,
Phani.