# How incoming invoices are validated

> The checks Alya Books runs on received documents and what errors and warnings mean.

Source: /help/en/incoming-invoices/validation

Every received XML document is checked against the PINT AE business rules and against your organization data. The result is stored on the invoice and summarised in the **Import log**.

## Where to see the result

1. Open the invoice from **Incoming Invoices**.
2. The **Validation report** card at the top lists each finding with its rule code (for example `BT-31`) and a message. Errors are red, warnings are amber.
3. Invoices with errors carry an **Errors** badge in the list and appear under the **With errors** chip.

## Errors

An error marks the invoice as invalid. You can still edit, accept or reject it, but the report stays on the invoice.

| Rule | Check |
|---|---|
| BT-1, BT-2, BT-5 | Invoice number, issue date (YYYY-MM-DD) and 3-letter currency code are present |
| BT-27, BT-31 | Supplier name present; supplier TRN, if given, is 15 digits |
| BT-48 | Buyer TRN, if given, is 15 digits |
| RECEIVER | The buyer TRN equals your TRN; the supplier TRN is not your own TRN |
| BG-25, BT-153 | At least one line, each with a description |
| BT-106, BT-110, BT-112 | Sum of lines equals the subtotal; VAT subtotals equal the VAT total; subtotal + VAT equals the total |

## Warnings

| Rule | Check |
|---|---|
| BT-24 | The document does not declare the PINT AE specification |
| BT-31 | No supplier TRN (allowed only for non-registered suppliers) |
| RECEIVER | No buyer TRN, so Alya Books could not confirm the document is addressed to you |
| BT-129, BT-131 | Line quantity not positive; quantity × price differs from the line amount |
| BT-117, BT-119 | VAT amount differs from rate × taxable amount; standard-rated VAT is not 5 % |
| BT-25 | A credit note without a reference to the original invoice |
| IBR-159-AE | Invoice in another currency without an exchange rate to AED; Alya Books uses the UAE Central Bank rate instead |
| IBR-175-AE | Invoice in another currency that does not state VAT and the total in AED, or whose VAT in AED does not match VAT × exchange rate |

## Good to know

- Amount checks tolerate a difference of 1 fils for rounding.
- PDFs and images are not validated against PINT AE. Their report only notes the AI reading confidence, a supplier TRN that is not 15 digits, a buyer TRN that is not yours, and totals that do not add up.

## Related

- [Upload UBL XML, PDF or image files](/help/en/incoming-invoices/upload-and-import)
- [VAT categories and the TRN](/help/en/vat/tax-categories-and-trn)
- [Currency and exchange rate on incoming invoices](/help/en/incoming-invoices/default-currency)