pc1.setDefaultLockGroupStringField("pm1 value");
pc1.setExplicitDefaultLockGroupIntField(1);
OpenJPAEntityManager pm2 = getPM(false, false);
startTx(pm2);
LockGroupPC pc2 = (LockGroupPC) pm2.find(LockGroupPC.class, oid);
pc2.setLockGroup0IntField(2);
OpenJPAEntityManager pm3 = getPM(false, false);
startTx(pm3);
LockGroupPC pc3 = (LockGroupPC) pm3.find(LockGroupPC.class, oid);