Generic delta issue - The first delta upload

Hi,

I created a datasource with generic delta.

In BW, at the first time I loaded init delta without data. After that, I loaded delta. But it uploaded all the data, not only the delta.

At the next delta uploading I get delta as well. But I checked it at test system, therefore, before I transfer to production system, I want to know how can I upload delta at the first time and getting exactly the delta and not all data?

Best Regards,

Mohamad.