Special purpose ledger

Hi,

I am working with special purpose ledger, the requirement is that i have to bring data from 3 diff source system to 3 diff cubes.

does spl have std cubes.

what shud i do on bw side and what shud be done on R/3 side.

i know that the data comes from ZGLT1T table.

when i try to generate transfer structure for this table it says y do not have authorization to install tables in FI-SL. i get the same message "for create info source for ledger". And what does generate data source for set hierarchies do?

Any help is rewarded

Thankyou,