[Koha] MARC Framework

Hi! I need do changes in the 'tags' of the MARC Framework. I do it in Koha-Intranet, and then I try to add a MARC record, but my changes don't work 'fully': - delete a 'tag' works - modify a 'tag' don't work - add a 'tag' don't work - I want use a 'tag' that already exist but not appear in 'Add MARC record', What I must do it? I try to rebuild de zebra-index (with bin/migration_tools/rebuild_zebra.pl -b -a -reset), all ok, but the changes don't work. What happen? Iago Lorenzo Salgueiro