secondary nameserver for subdomains and notify messages to itself

[fddi]

Hello,
I have primary DNS server for TLD domain mydomain.org which is also a 
secondary  DNS server for many other subdomains like
domainX.mydomain.org



this name server IP Address is 131.x.y.z  domain is mydomain.org ang his 
hostname is server2.mydomain.org

he si serving as secondary the domains:

domain1.mydomain.org
domain2.mydomain.org
domain3.mydomain.org

and so on...

in the log file I see that I have many notify messages from itself for 
the subdomains (domain1,domain2,domain3...)

for example for subdomain  domain1.mydomain.org I have the following logs

Jul  8 16:56:29 server2 named[27607]: zone domain1.mydomain.org/IN: 
loaded serial 2003043171
Jul  8 16:56:31 server2 named[27607]: zone domain1.mydomain.org/IN: 
sending notifies (serial 2003043171)
Jul  8 16:56:35 server2 named[27607]: client 131.x.y.z#31030: received 
notify for zone 'domain1.mydomain.org'
Jul  8 16:56:35 server2 named[27607]: zone domain1.mydomain.org/IN: 
refused notify from non-master: 131.x.y.z#31030


in named.conf I have

zone "domain1.mydomain.org" {
         type slave;
         file "for/domain1.mydomain.org";
         masters {
                 192.a.b.c;
         };
};

so it is correct to have log files with notifies from 192.a.b.c but 
anyway the DNS mail server keeps notifying itself
that he is not master for the subdomain... how to avoid these useless 
notification ?

thank you

Rick