[Samba] Undestructible DNS entry

[mathias dufresne]

Hi all,

I'm unable to delete a DNS entry, this entry does not exist.

The entry is A record in _msdcs zone for an old DC which was demoted.

I tried to use samba-tool dns to delete it but without success:
samba-tool dns delete m703 _msdcs.ad.domain.tld \
  m701._msdcs.ad.domain.tld A 10.16.28.27 -k yes
ERROR: Record does not exist

I found undeleted entry in LDAP, removed it without success:
the entry:
ldbsearch -H $sam -b 'DC=DOMAINDNSZONES,DC=AD,DC=DOMAIN,DC=TLD'
objectclass=* | grep 701
dn:
DC=m701,DC=ad.domain.tld,CN=MicrosoftDNS,DC=DomainDnsZones,DC=ad,DC=domain,DC=tld
name: m701
dc: m701
distinguishedName: DC=m701,DC=ad.domain.tld,CN=MicrosoftDNS,DC=Dom

Of course I can't delete this entry from RSAT DNS tool, the error is:
The record cannot be deleted.
The record does not exist.

The question is simple: how to get rid of that entry?
If I was gambler I would bet on some data, possibly base64 encrypted,
remaining on some other LDAP entry. I mostly lose my bets.

Thank you for your time, best regards,

mathias