GST
Duplicate IRN error on the e-invoice portal
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Facts
The IRN is derived from your GSTIN, financial year, document type and document number. If an IRN was already generated for that combination, even once and then cancelled, the IRP rejects a second request as duplicate.
Provisions and law
- Rule 48(4), CGST Rules 2017Notified persons must upload invoice details to the IRP and get an IRN
- Rule 46, CGST Rules 2017Contents of a tax invoice, including a unique serial number up to 16 characters per financial year
Analysis
This often happens when software retries after a time-out, so the first request actually succeeded. Fetch the existing IRN using the document details instead of generating again. If the invoice was cancelled, use a new document number for the replacement.
Conclusion
- Search for the existing IRN with the document details
- Use the existing IRN if the first request succeeded
- If it was cancelled, issue the replacement under a new number
- Fix software retry settings
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