> For the complete documentation index, see [llms.txt](https://amast-einvoice.gitbook.io/amast-einvoice-sass/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://amast-einvoice.gitbook.io/amast-einvoice-sass/error-reference.md).

# Error Reference

| HTTP  | When                                                              | Action                                                    |
| ----- | ----------------------------------------------------------------- | --------------------------------------------------------- |
| `400` | Validation, bad envelope, missing idempotency, invalid TIN params | Fix request; new idempotency key if new logical operation |
| `401` | Missing/invalid API key                                           | Fix auth                                                  |
| `402` | Insufficient credits                                              | Top up; retry same idempotency if same payload            |
| `404` | Status batch not found; cancel document not found                 | Check IDs and tenant                                      |
| `409` | Idempotency conflict; duplicate document; cancel not Valid        | Inspect body; do not blindly retry                        |
| `502` | LHDN upstream error on validate TIN                               | Retry with backoff; check `lhdnStatus`                    |
| `500` | Server error                                                      | Retry later with same idempotency + same body             |

## Submit validation messages (examples)

* `submission_type is required when using an object body`
* `Item 0: recipient is required for non-consolidated submissions`
* `Item 0: document_date (or documentDate) is required in YYYY-MM-DD format`
* `Item 0: relatedInvoice.referenceId is required for credit_note`
* `Item 0: relatedInvoice.lhdnUuid is required for credit_note`
* `A maximum of 100 documents is allowed per request`
* `Duplicate documentType + referenceId in batch`


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