MC03BF0 vs MCMSEG

Dear Experts

After activating an enhanced datasource for 2LIS_03_BF , in LBWE, extract structure maintenance, i am still unable to see the new zfields in MCMSEG.

I appended structure in MC03BF0.

Please advise why in lbwe, the maintenance for structure for Extract structure MC03BF0 is MCMSEG.

Are they the same ?

Should the new fields show in MCMSEG?

Please advise. Thanks very much.

Regards

Pascal