[Koha] from ISIS to Koha

Hi, I've a (future ?) customer that want to switch from winISIS to Koha. He sends me lot of exports, but none of them work with classic dumpmarc.pl script of Koha (refused by MARC::Record) Does anyone here know how to setup winISIS export options to get a valid iso2709 file ? Thanks -- Paul POULAIN Consultant indépendant en logiciels libres responsable francophone de koha (SIGB libre http://www.koha-fr.org)