samba - Oct 2012 - Samba 4 internal DNS - how to modify SOA record

Hello.
How could one modify a SOA record in rc3? For example, NS part (not NS record)
of SOA record points to an absent Windows server. This effectively breaks DNS
updates, since there is no such server and if corresponding A record is added,
update requests from clients will come unsigned.
Editing it directly via LDAP breaks Samba (some sort of checksum/hash?) MMC
snap-in says "Zone not loaded by DNS server", so it is not possible to
use it either. samba-tool dns add|delete|update can't operate on SOA record.
Maybe someone could give a link to some document describing dnsRecord, so one
could forge a valid record and just change dnsRecord in DC=@ using some LDAP
tool?

Thanks in advance.
-- 
Best regards,
Dmitry Khromov