Generic datasource safety interval upper limit 1 on changed date

Hi All,

I have created a Generic Data source on a table and have set changed date as delta specific field with upper limit as 1, and lower limit blank.

I have created the test data in D system on 06/27/2016(June 27 2016) and extracted into BW. I can see the new records in BW.

Now i tried changing the data on the same day 06/27/2016 in ECC and i tried to extract data into BW, but it is fetching 0 records.

Can you explain how safety interval upper limit 1 on changed date work?

Correct answer will be rewarded.

Regards,

FM.