Regarding the ETL process using transactional data

Hi All,

I am student pursuing my Masters and I am specializing in Business Intelligence.

I have few doubts regarding the ETL process in SAP.

I am using transactional data.

What if I made a mistake during loading? What if I loaded the same transaction data twice? Do I delete, reload or is there a simple way to resolved the issue?

Thanks,

Sudhanwa