If an invalid BDE driver file is installed on the users machine while batches are posted, entries are duplicated in the PR_JOURNAL table.  The following query is helpful to locate these duplicate postings:

select b.batch, b.cnt, j.cnt
from
(select batch,count(*) as cnt from batch_detail group by batch) b,
(select batch,count(*) as cnt from pr_journal group by batch) j
where to_char(b.batch)=j.batch
and b.cnt <> j.cnt

See CSI4x - duplicate batch entries caused by SQLORA8.DLL for more information on this issue and how to resolve it.