In General Ledger account systems, administrators can choose whether or not to allow transactions to be created without a transaction mapping. This setting is chosen under Tasks > Configuration > Unmapped transaction setting. When it is set to "allow" these transactions, a "Review unmapped transaction messages" setting becomes available, which allows users to view unique messages generated for transactions with incomplete or missing mappings. From here, the "Update unmapped transactions" task lets users make corrects to incomplete mappings.
However, when running this process, sometimes instance with a large (1000+) number of occurrences, hangs and does not complete.