[Koha] cant view barcodes in opace MARC view

Dear all, i loaded approx 500000 records from oracle MIS to KOHA ILS but facing a bit problem now everything is fine except when i search a book with multiple accession it show no of copies in normal view but when i click on MARC View then it show just one record....need positive comment plzzzzzzz -- Kind Regards, Sajid Ali DBA/Developer College of Aeronautical Engineering