There are 2 indexes (at least in CU10) that do not allow duplicates. There's the obvious RecId, which could suggest a System sequences issue, and there's JournalNumberLedgerIdx, which contains the fields JournalNumber, FiscalCalendarYear, and Ledger. JournalNumber draws from the number sequence with Reference "General journal transfer" found under General ledger parameters. If it's not that, we'll give you some SQL queries to check for a SystemSequences issue.
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