# Customer replies errors

All error codes returned by the Customer replies endpoints (4 total).

Every error returned by the **Customer replies** endpoints. Click any code for the full example response and localized messages.

| Code | Message |
|------|---------|
| [`INVOICE_REPLY_ATTACHMENT_NOT_FOUND`](/errors/INVOICE_REPLY_ATTACHMENT_NOT_FOUND) | Invoice reply attachment not found. |
| [`INVOICE_REPLY_DUPLICATE`](/errors/INVOICE_REPLY_DUPLICATE) | A reply with this channel and external identifier already exists. |
| [`INVOICE_REPLY_INVOICE_NOT_ISSUED`](/errors/INVOICE_REPLY_INVOICE_NOT_ISSUED) | Replies can only be registered about an issued invoice: this one is a draft or is scheduled. |
| [`INVOICE_REPLY_NOT_FOUND`](/errors/INVOICE_REPLY_NOT_FOUND) | Invoice reply not found. |

## Keep exploring

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  <Card title="Handling errors" description="Response shape, the type URI, and programmatic patterns." href="/guides/handling-errors" />
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Full OpenAPI spec: https://docs.beel.es/api/openapi