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# AutoBill.writeOffInvoice

Marks an `Invoice` as `writtenOff`, the debt unable to be collected.

## Input

*srd*: sparse response description, a SOAP string (which must be a JSON object), in which you specify the elements you want returned.This parameter enables the calling system to constrain a `method` call to return only components you specify. This gives you greater control over returned content, and improves response time within the Vindicia platform by reducing the processing needed for the call.

Some fields are required, either practically or in the WSDL, and will be returned regardless of the *srd*. A null *srd* returns the complete response.

*autobill*: the `AutoBill` associated with the Invoice to be written off.

*invoiceId*: the ID of the Invoice to write off.

## Output

*return*: an object of type `Return` that indicates the success or failure of the call.

## Returns

In addition to those listed in [The Return Object](The_Return_Object), this call returns:

| Return Code | Return String |
| - | - |
| `400` | One of the following: - `AutoBill not found.` - `Invoiced ID not provided.` - `Failed to write off invoice: *error-description*.` |
| `404` | `Invoice ID not found.` |

## Example

```

$autobill = new AutoBill();
$autobill->set($abID); // for some $abID

$response = $autobill->writeOffInvoice('inv-bac');

// check $response
```

**Parent topic:**[AutoBill Methods](../topics/AutoBill_Methods)


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