Transfer Order Item Receipt

Question

I'm battling with the item receipt on a Transfer Order. I've tried what is available in their documentation without any luck.

I've tried the following:

POST https://<accountID>/services/rest/record/v1/transferorder/{{TRANSFER_ORDER_ID}}/!transform/itemreceipt

With the following payload:

{
    "item": {
        "items": [
            {
                "orderLine": 4, 
                "itemReceive": true,
                "quantity": 1
            }
        ]
    }
}

And I've tried the following payload with line + 1, as the line number doesn't always reflect the same line number on a transfer order:

{
    "item": {
        "items": [
            {
                "orderLine": 5, 
                "itemReceive": true,
                "quantity": 1
            }
        ]
    }
}

I get the following error:

{
    "type": "https://www.rfc-editor.org/rfc/rfc9110.html#section-15.5.1",
    "title": "Bad Request",
    "status": 400,
    "o:errorDetails": [
        {
            "detail": "Error while accessing a resource. You have attempted an invalid sublist or line item operation. You are either trying to access a field on a non-existent line or you are trying to add or remove lines from a static sublist.",
            "o:errorPath": "item",
            "o:errorCode": "USER_ERROR"
        }
    ]
}

When I get the items on the transfer order:

GET https://<accountID>.suitetalk.api.netsuite.com/services/rest/record/v1/transferorder/{{TRANSFER_ORDER_ID}}/item

These are the items on that transfer order:

{
  "links": [
    {
      "rel": "self",
      "href": "https://<accountID>.suitetalk.api.netsuite.com/services/rest/record/v1/transferorder/{{TRANSFER_ORDER_ID}/item"
    }
  ],
  "items": [
    {
      "links": [
        {
          "rel": "self",
          "href": "https://<accountID>.suitetalk.api.netsuite.com/services/rest/record/v1/transferorder/{{TRANSFER_ORDER_ID}/item/1"
        }
      ]
    },
    {
      "links": [
        {
          "rel": "self",
          "href": "https://<accountID>.suitetalk.api.netsuite.com/services/rest/record/v1/transferorder/{{TRANSFER_ORDER_ID}/item/4"
        }
      ]
    },
    {
      "links": [
        {
          "rel": "self",
          "href": "https://<accountID>.suitetalk.api.netsuite.com/services/rest/record/v1/transferorder/{{TRANSFER_ORDER_ID}/item/7"
        }
      ]
    },
    {
      "links": [
        {
          "rel": "self",
          "href": "https://<accountID>.suitetalk.api.netsuite.com/services/rest/record/v1/transferorder/{{TRANSFER_ORDER_ID}/item/10"
        }
      ]
    },
    {
      "links": [
        {
          "rel": "self",
          "href": "https://<accountID>.suitetalk.api.netsuite.com/services/rest/record/v1/transferorder/{{TRANSFER_ORDER_ID}/item/13"
        }
      ]
    }
  ],
  "totalResults": 5
}

I'm trying to update line/item 4. I've tried including line 4 and 5 in my payload with the same error.

Any help will be greatly appreciated!