Zone transfer deferred due to quota

[Sim]

Hi !

I have set this in SLAVE:

       /*
          Only used by slave zones.
          transfer-in determines the number of concurrent inbound zone
transfers.
          Default is 10. This statement may only be defined in a
global options clause.
        */
        transfers-in 100;



and this in MASTER:

        /*
          Only used by master zones.
          transfers-out determines the number of concurrent outbound
zone transfers.
          Default is 10. Zone transfer requests in excess of this
limit will be REFUSED.
          This statement may only be defined in a global options clause.
        */
        transfers-out 100;


but I have always this problem:

Sep  4 17:13:24 ns2 named[9473]: zone
0.168.192.in-addr.arpa/IN/external-in: refresh: retry limit for master
192.168.0.2#53 exceeded (source 192.168.0.1#0)
Sep  4 17:13:24 ns2 named[9473]: zone
0.168.192.in-addr.arpa/IN/external-in: zone transfer deferred due to
quota


Can You help me?

Thanks