Delta on Generic extractor

Hi Gurus,

Need help. Already read lot of SCN posts. We have a requirement to create a generic extractor on 2 tables (tableA and tableB).

Need to extract the fields from both the tables. Have to apply a filter on a field in table B.

TableA is having 2 date fields(AEDAT & ERDAT) and need delta on both 2 fields. Please correct my understanding.

1) As delta is needed on 2 date fields, i have to create a function module extractor to handle the

delta on both the fields or 2 datasources with view on 2 tables with delta on each date field.

or

2) Can we handle the delta from the infopackage selections on the date fields instead of making

the generic extractor delta enabled? If yes, please let me know the steps to do.

Also which is the preferable way?

Appreciate your help in advance.