AW: trying to delete project: JDO error

[Lustig, Marc (Allianz Deutschland, externer Mitarbeiter)]

I deleted all schedules (except the default) and notifiers and tried again to 
delete the project itself. Result:

javax.jdo.JDODataStoreException: Delete request failed: DELETE FROM `PROJECT` 
WHERE `ID` = ? NestedThrowables: 
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: 
Cannot delete or update a parent row: a foreign key constraint fails 
(`continuum/BUILDRESULT`, CONSTRAINT `BUILDRESULT_FK3` FOREIGN KEY 
(`PROJECT_ID_OID`) REFERENCES `PROJECT` (`ID`))


MySQL-version is 5.0.32
driver-version is mysql-connector-java-5.1.6-bin.jar

somebody experienced that too ?