Repliation of Ecc Org Structure

Hi,

Question -1

I am new to SRM and I would like to know how purchase org and purchase group are replicated from ECC.

I can able to maintain backend ECC organization data in SRM organization structure but not sure whether these data are replicated.

Is it replicated through CRM Middleware (Customizing objects), If so what is the adapters used?

Question -2

IsGL accounts are replicated from backend ECC and maintained in SRM config or GL accounts manually maintained in SRM under

"Define GL accounts for product category and account assignment category" ?

Regards,

Vishnu