I have the following setup.

Class, say, Car that has a CarPart (belongsTo=[car:Car]).

When I'm creating a Car I also want to create som default CarParts, so I do

def car = new Car(bla bla bla)
def part = new CarPart(car:car)

Now, when I do car.validate() or part.validate() it seems fine. But when I do if(car.save && part.save() I get this exception:

    2012-03-24 14:02:21,943 [http-8080-4] ERROR util.JDBCExceptionReporter  - Batch entry 0 insert into car_part (version, car_id, id) values ('0', '297', '298') was aborted.  Call getNextException to see the cause.
2012-03-24 14:02:21,943 [http-8080-4] ERROR util.JDBCExceptionReporter  - ERROR: value too long for type character varying(6)
2012-03-24 14:02:21,943 [http-8080-4] ERROR events.PatchedDefaultFlushEventListener  - Could not synchronize database state with session
org.hibernate.exception.DataException: Could not execute JDBC batch update

Stacktrace follows:
java.sql.BatchUpdateException: Batch entry 0 insert into car_part (version, deal_id, id) values ('0', '297', '298') was aborted.  Call getNextException to see the cause.
    at org.postgresql.jdbc2.AbstractJdbc2Statement$BatchResultHandler.handleError(AbstractJdbc2Statement.java:2621)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1837)
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:407)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeBatch(AbstractJdbc2Statement.java:2754)
    at $Proxy20.flush(Unknown Source)
    at ristretto.DealController$_closure5.doCall(DealController.groovy:109)
    at ristretto.DealController$_closure5.doCall(DealController.groovy)
    at java.lang.Thread.run(Thread.java:722)

Any ideas?