Hi Srikanth,
you were right again, I've ran the extraction and AUFNR field was populated with data, even though it was not visible in LBWE.
But I've done another test - I have added a new field in LBWE. ZZMC11VA4KON structure was reactivated and AUFNR field disappeared.
So I've decided to enhance the Data Source in RSA6 and fill the fileld in CMOD in case of future changes of the Data Source.
Thanks for help everyone!