Hi Surbhi,
Do what Salman says in point 1:
1: When you enhanced PR screen using MEREQ001 enhancement, and adding your customer field in CI_EBANDB include, then this field automatically becomes part of MEREP_OUTTAB_EBAN structure. Hence, no additional Append to MEREP_OUTTAB_EBAN is required.
Aso as a point 2:
I found a PERFORM bam_daten_lesen(sapfm06b) that fills la it_eban table with data, what you would do is create an enhancement after this PERFORM an write the code to fill the field into the it_eban table, it works to me.
Bye
Juan Camilo