Common FBR Errors — Causes and Fixes
By System
Updated Nov 05, 2026
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Use this reference to quickly identify and resolve FBR submission failures.
Error Reference Table
| Error | Likely Cause | Fix |
|---|---|---|
| 401 Unauthorized | Wrong POS ID or Token | Settings → FBR → correct credentials |
| Invalid UOM Code | Unit has no FBR code | Settings → Units → add FBR UOM code |
| PCT Code Required | Product missing HS code | Edit product → FBR tab → add HS code |
| Duplicate Invoice | Already submitted to FBR | Check FBR Logs for existing FIN; do not retry |
| NTN Mismatch | Business NTN doesn't match FBR records | Settings → Business Settings → correct NTN |
| Timeout / No Response | FBR servers are temporarily down | Wait 5–10 min and retry. Check fbr.gov.pk for status. |
📌 Note:After fixing the issue, always retry the sync from Sales → List Sales → Actions → Sync with FBR — not by deleting and re-creating the invoice.
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