Hi,
If the batch isn't posted, there will be no posting journal. Also, the invoices won't be in History for future inquiries, reports won't be updated, etc..
It's probably best to restore from a prior backup.
If they're using Novell, they should make sure that all of the latest client service packs have been installed and that opportunistic locking, file caching and file commit are turned off.
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Regards,
Softrak Tech Support