Exact duplicateSame supplier, invoice reference, amount and payment history.
Normalized invoice duplicateInvoice references compared after removing punctuation, prefixes, spaces and leading zeros.
Cross-vendor duplicateSame economic invoice paid under separate vendor IDs or legal-name variants.
Near-duplicate amount/dateSame supplier with similar amount and close invoice or payment dates, routed for manual evidence review.
Split or repeated settlementMultiple payments that appear to settle one obligation more than once.
Unapplied credit candidateSupplier credits or credit memos that may remain unmatched to later payments.