[Koha] biblio.frameworkcode set up at import

Hi, I've tried to set up the biblio.frameworkcode at import time by setting up a link between the 099$e subfield and biblio.frameworkcode in koha. But it seems this fields in not updated in either way. Even if i create a new non-default notice and that I export the notice, the 099$e subfield is not created in the export files (marcxml, ...). Do i miss something? I'm using koha-3.00.06. Best Regards, Frédéric