Data source enhancement while loading deltas

Hi Experts,
I've a scenario that while loading deltas do we perform data source enhancement if we can how do we do that.
This is i got a requirement, to enhance 2LIS_11_VAITM, while loading deltas. Now how do I go about this what are the exact steps that i follow to enhance.
Could s'one help in this regard because i'm new to the ABAP.
Thanks & Regards,
Amar

hi,
  Go to the extract structure of this datasource and display the extract structure of the datasource in SE11 and click on APPEND STRUCTURE and click on the tick mark and try to add the fields required into the lines. You need to populate the data on to these new enhanced fields in the user-exit. But when you move these transports to production environment, you have to stop deltas and re-initialize the datasource....
Hope it helps...

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