multi-master and ixfr-from-differences: failed: new serial (2010060900) out of range"

Hello, I run slaves for root zone on two machines, they behave as one of masters for each other and for all our resurcive servers providing ixfr (I work for an ISP so I think it's feasible for us) and I ocationally get these error in log file: Jun 9 23:11:58 mydb02 named[1427]: general: error:

dynamic updates originated in the localhost, where the localhost is part of another view

1. With     view "int" {     match-clients { ! key test-key; localhost; };     ...     };     view "test" {     match-clients { key test-key; };     zone "test" {             type master;             update-policy {            grant test-key name m1.test.;             };