Zone transfers and recursive name servers

Hi.
I am using Bind as a name server for domain1, that delegates
sub domain sub1.domain1, on some other name server.
this works fine when I am trying to resolve A and SRV records
, so when I test it and trying to resolve them from the parent
domain name server, the Bind (the parent domain NS) behaves as a recursive name server, resolves the records from it's subdomain's server, and returns them to the resolver.
However, when I am trying to request a zone transfer from that
same subdomain, i get a 'Not authoritative' reply from the bind.
When i send the request directly to the delegated name server
of the subdomain, the zone transfer works fine.
I don't understand this behaviour, I mean, why does Bind
behaves as a recursive name server for A and SRV records of
a certain subdomain, but will return 'Not authoritative' for
zone transfer of the same subdomain ?
Any explanations would be appreciated.
Thnx.

generally you setup an ACL, like:

acl "xfer" { 70.184.242.242; 192.168.1.1;
};


and then provide

allow-transfer { xfer;};
in your named.conf.local

Then the other DNS, the one slaved to your master has to have lines like:

zone "foobaz.com" {
type slave;
file "/var/named/foobaz.com.zone";
masters { 10.1.167.76; };
};