Dear Pratik,
Request you to first add Customer classification field (ZZKUKLA) in KOMK structure insted of structure KOMP. Becasue it is header structure filed. After add this new filed in KOMK structure, Add this new filed in your field catelog and than create table and new access sequence. Also request you to select KOMK structure in your access sequence against this new field Customer classification ZZKUKLA.
Regards,
Haresh Panara