Need help on extraction of field VBUP-UVP01 in BW

Hi All,

In our system, we have enhanced 2LIS_11_VAITM datasource to bring data for UVP01 field in BW. 

I can see the field in append structure of extract structure MC11VA0ITM (see attached screenshot), but I don't see any ABAP code in CMOD to populate this field. So my question is how this field is getting populated?

Other problem is we are not getting correct delta for this field. Some orders
are closed and has VBUP-UVP01 as "C" in in R/3, but in BW it still shows as
open.

Please suggest how can we capture delta for this field correctly, without going for full load option everyday.

Thanks and Regards,

Jharna Patel.