Re-deploying your PXE Representative might solve your problem. If that does not help, you probably have to delete the device from the DB and run a full inventory scan to generate a new record.
I am going to try that a little later today and I will report my findings back here.
Be aware that there is also an issue with software distribution in provisioning in LDMS 9.0 SP4. I'm not sure if this affects everyone however there is a workaround for it and LANDesk are goign to evelop a patch also.
I had to delete the device out of the database.