0071·The buyer NTN is invalid
Buyer & seller identityOccasional
What this means
Distinct from a formatting failure — the shape is right but no taxpayer exists behind it, or the entry is not permitted for this taxpayer.
Why it happens
- A digit error produced a number that passes length validation but matches nothing.
- A placeholder or test number reached production.
- The number belongs to a deregistered entity.
How to fix it
- 1Verify every registration number against FBR's lookup at customer creation.
- 2Purge placeholder customers before going live.
How Ordyoo handles this
Registration numbers are verified against FBR when a customer is saved, so invalid numbers cannot reach an invoice.
Related errors
Stop debugging FBR payloads by hand
Ordyoo builds and submits compliant invoices so most of these rejections never reach you. Start free.