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M8 108

Invoice already entered — duplicate invoice check

MIRO or an inbound invoice raises a duplicate-invoice warning/error because SAP finds an existing invoice with matching duplicate-check criteria.

Likely root causes

  1. The supplier invoice was already posted.
  2. Reference, invoice date, amount or company-code data matches an existing invoice closely enough to trigger duplicate checking.
  3. An interface resent the same invoice after a timeout or acknowledgement failure.

What to inspect

  1. Supplier invoice reference and invoice date.
  2. MIR4/MIRO document search for an existing posting.
  3. Vendor/company-code duplicate-invoice-check settings.
  4. Interface retry/idempotency logs if the invoice arrived electronically.

Resolution path

  1. Confirm whether an accounting document already exists before retrying.
  2. If this is a true duplicate, stop the repost and correct the upstream resend process.
  3. If the document is genuinely different, correct the reference/master-data fields that caused the false match according to policy.
  4. Retest without disabling duplicate controls globally.

ERPClimb is an independent platform and is not affiliated with SAP SE.