TxnProof conversion guide
Why QuickBooks skips a duplicate FITID
Financial-institution transaction IDs help accounting software avoid importing the same bank record twice. Reusing or changing those IDs without understanding the source can hide real problems.
What FITID represents
FITID is the identifier supplied for a financial transaction in OFX-family data. A repeated identifier can be evidence that the record has already been imported.
Check the source before editing IDs
Compare date, amount, payee and the original bank export. Two similar transactions may be legitimate repeats, while a reused FITID may reflect a source or conversion problem.
Review semantic duplicate candidates
When no stable FITID exists, same-date, same-amount and normalized-payee matches are only candidates. A human should decide whether both transactions are real.
Keep the external import gate
Validate the QBO in the intended QuickBooks file and retain the receipt and manifest. Do not treat a successful conversion as proof of reconciliation or tax correctness.