Inventory Data Loading from SAP ECC into BODS

Hi,

We are planning to load inventory data in bods from SAP ECC by using SAP BW Extractors.

After reading few articles from the SCN forums, we have understood that there are certain steps which we need to follow to load Inventory data.

I have these doubts while implementing the same in SAP BODS, kindly Suggest.

1) Marker update option in bods.

2) Delta Load.

Thanks in Advance

Anil