I was working in a package and I was requested to set the import task as transaction consistent. In SSIS you can do all sorts of ETL stuff so when you import data you need to make sure the import is in consistent state which means either all the data should gets loaded or it should be rolled back to the previous state. You can enable this option either in package level or container level or at task level. Based on your requirement you can set the transaction property so the final output is in consistent state.