Supply chain context · Wise Supply Chain
Rejections on a combined platform usually mean the customer or product record your purchasing and sales teams already use does not match FBR expectations—not that “the API is random.” Classify the message, fix catalog or buyer once, re-validate, then re-post the same invoice. Avoid creating a duplicate sales event in SCM until you confirm the first post did not succeed.
FBR/PRAL errors often read like the table below. Exact strings change with API versions; the fix is still: correct buyer, line, or tax at the source, not “try again and hope.” For the complete official FBR Sales Module error reference (every code from 0002–0302 with cause and action) see our blog page FBR Sales Module error codes — complete reference & fixes.
Real error message patterns & exact fixes
| Typical message (pattern) | What it usually means | Copy-paste fix (do in order) |
|---|---|---|
| Invalid HS / HS code does not match | Product master and FBR’s catalog for HS + UoM are out of sync. | (1) Open product. (2) Set HS and UoM to the FBR-recognized pair. (3) Re-save. (4) Re-validate invoice. (5) Re-post. |
| NTN not found / invalid registration | Buyer ID or type does not match IRIS view of the buyer. | (1) Re-verify buyer NTN and registration type. (2) Match province. (3) Re-fetch FBR data if your product supports it. (4) Re-validate, re-post. |
| Line tax mismatch / tax calculation error | Further tax, extra tax, or line math disagrees with FBR rules for that line. | (1) Remove manual overrides. (2) Let the engine recalc from unit price, qty, rates. (3) Re-check buyer class. (4) Re-validate, re-post. |
| UoM not allowed for HS | Unit of measure is wrong for the declared HS on that line. | (1) Check catalog UoM (NOS, KG, etc.) against FBR table. (2) Adjust product default. (3) Rebuild line, re-validate, re-post. |
| Token expired / auth failed [non-invoice] | Credential or environment issue—not line data. | (1) Re-authenticate in app. (2) Confirm production vs sandbox URL. (3) Check server time. (4) Retry after a successful auth test call. |
Line items and product data
Most “mystery” errors are actually catalog problems. A structured digital invoice software process keeps every line generated from the same product row every time; ad hoc line typing breaks that contract.
Buyer and registration context
When buyer data disagrees with FBR records, validation stops early—before you burn time on tax. Good software forces FBR API integration hygiene: verify once, then reuse.
Tax lines and rate combinations
Sales tax, further tax, extra tax, FED, and withholding each have rules. If your subtotal in Excel and your digital invoice disagree by one rupee, the FBR payload may fail—fix the engine, not the printout. Reference validate → post → record in the main FBR digital invoicing guide.
How Wise Supply Chain helps
We focus on FBR validation before you commit and a clear log of responses. Sign in or contact for a free demo if you are migrating from a high-rejection stack.
FAQ: FBR invoice errors
- What is the fastest way to fix a rejected invoice?
- Classify: buyer, line/HS, tax, or auth. Change data once at the source, re-validate, re-post. Do not duplicate the business event with a new invoice until you are sure the first was not posted.
- Are blog articles enough for our audit?
- Blogs and guides educate; your audit needs your own SOPs and FBR-consistent records. Use this page to train the team, then own the process in your org.
Stopping repeat errors across ops and finance
Train warehouse and sales on HS + UoM discipline at product setup; finance owns tax rate and further-tax rules on the same SKU. When GRNs and sales share one item master, FBR line rejections drop because the field ops keyed is the field the API validates. Pair this page with our complete FBR Sales Module error reference blog for code-level lookup.
Supply chain with FBR digital invoicing (full guide) · Supply chain software in Pakistan · Inventory & warehouse management