Data source enhancement(LO & FI)

Hi,

I have standard data source and loaded data with full  and delta's running into BI side,Now we have requirement to add 2  new fields to the same data source.Without disturbing the delta loads ,how can i get the data for 2 added fields from ECC to BI side.I am confused

Whether 1. I need to delete the setup tables and fill again in ECC

               2. In BI side i need to drop the data in the infoprovider and load again or create separate flow it.

               3. How it happens for LO and FI.

Could any one help me on this.

Regards,

krishna.T