Postgresql and Creator2 commitChanges()

Hi.

Sun Java Studio Creator 2 and PostgreSQL 8.1 database
using 8.1-405 jdbc3.

Connectin,fetching,... works.

But "someDataProvider.commitChanges()" works only first time.
Then the only message i get after "someDataProvider.commitChanges()" is
"can't change isolation level in the middle of transaction".
I must use stored procedures for update and insert records. It works
fine.

When i change the data provider to MySQL
all works fine (i mean "someDataProvider.commitChanges()").

Can anybody comment ?.

Thanks.