First things First. The only reason that checkbox is even available is that in GL Setup, the "Interface to G/L Journal Trx File" is checked. This should never be checked IMHO. What is does is twofold:
1) Rather than posting directly to the GL, it creates an unposted G/L Journal Trx batch, which must be posted manually.
2) It disables drilldown features of Macola's G/L.
If you can see an upside in either of those 2 situations, please let me know.
So First things First, change the flag in GL Setup, and this will never happen again.
On to your question, I know of know what to reverse an entry after the fact, as entries are normally defined as reversing entries (or not) at the time they are entered.
However, if you can isolate the duplicate and triplicate entries in question, then delete them from the GLTRXHST_SQL table, then run a recalculate GL Account Balances, you should be fine.
Having said all of that, I would definitely tread cautiously and try this in a test environment until you are sure this is the answer.
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