Delta Missing quick help needed

Hi,

Yesterday we have upgaraded the R/3 4.6C to ECC. Upgrade was succesful.

After upgrade without changing the delta setting of the datasource, we loaded the data into R/3 from legacy system. Then BW did not find any delta data, it is bringing 0 records to BW.

How to enable last load as again delta in R/3 and Is there any possibilities to recall the entire data which was posted last day?

Quick answer will be helpful.

Thanks & Regards

Srinivas