SAP ECC to BODS to BW

Hi Guru's,

Good Day..!

We have a below requirement to meet the business expectations..

i.e how can we load data from ECC to BW using BO-DS as a semantic layer.

1) As SAP standard flow we have Standard Delta's method and Delta queue Monitor(RSA7) (This happens in general flow SAP ECC-->BW), now we will have to load data from SAP ECC-->BODS--->BW, In this flow how delta's load will happen into BW using BO-DS.

2) How we will have to connect to SAP BODS from SAP ECC (As a Source) and then BW (As a target to BODS).

3) What are the challenges will have to face while setup above activities and what are the pre-requisites we need to done this activity.

Thanks,

Avi.