Issue Creating Invoice via Magento REST API: %fieldName% is not supported Error

Question

I'm trying to create an invoice using the Magento REST API (/rest/default/V1/order/{orderId}/invoice) and I'm getting the following error:

"message": "\"%fieldName\" is not supported. Correct the field name and try again.",
"parameters": {
    "fieldName": "AdditionalData"
}

Here's the payload I'm sending:

{
  "appendComment": true,
  "items": [
    {
      "order_item_id": 144,
      "qty": 1.000000,
      "additional_data": "{\"description\":\"HELLOOOOO\",\"um\":\"HELLOOOOO\"}"
    }
  ]
}

I also tried passing the additional_data as an extension attribute, but I received the same error. Can someone help me figure out what I'm missing? Thanks in advance!

magecomp.com/blog/call-api-to-create-full-invoice-magento-2

Ronak Rathod
– Ronak Rathod

2025-02-10 05:20:20 +00:00
Commented Feb 10 at 5:20 — Ronak Rathod
– Ronak Rathod, Commented Feb 10 at 5:20

Mageplaza · Accepted Answer · 2025-02-11 07:51:59Z

The Item do not have the additional_data

You can try it by code in your Custom module

Create file etc/extension_attributes.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
    <extension_attributes for="Magento\Sales\Api\Data\InvoiceItemCreationExtensionInterface">
        <attribute code="additional_data" type="string" />
    </extension_attributes>
</config>

Run bin\magento s:d:C

Then check

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