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When the booking-time duplicate guard flags a ledger-only voucher candidate (transaction_id null: a verifikat from an SIE import, a paid invoice, a salary payout), the dialog's primary action is now "Matcha mot verifikatet": it links the bank transaction to the existing voucher via /api/reconciliation/bank/link (the same path MatchVoucherDialog uses) instead of double-booking the same affarshandelse. "Bokfor anda" stays available but demoted to an outline button. Sibling-transaction candidates keep today's layout: matching a second bank line onto a voucher that already has one is the N:1 edge case, not the default. Wired through both call sites: the transactions page (runCategorize) reuses handleVoucherLinked's refresh, and TransactionBookingDialog (JournalEntryForm, /api/transactions/[id]/book path) reuses the booked flow so in-dialog attached documents land on the matched verifikat and the row leaves the list, with a "Bankhandelsen kopplad" toast instead of "Bokford". No lib change: the candidate payload already carries the transaction_id discriminator, covered by existing detection tests. Closes #919. Co-authored-by: Claude Fable 5 <noreply@anthropic.com>