What should I do if an imported and a manually added invoice both show the same sale?

Compare the invoice number, client, amount, currency, and issue date to confirm that the two records are duplicates rather than separate sales. Identify which record is linked to the real payment and which one came from your accounting system.

Do not pay, resend, or delete either record until you understand the link. Contact support with both invoice references and explain how each was added. Ask which record should remain and whether a correction must also be made in the connected accounting system. After the correction, compare the outstanding balance and payment status in both places. Keep a note of the retained record so the next import or retry does not recreate the problem.