Netsuite REST API for cross-subsidiary item fulfillment

I get the following error when I call the item fulfillment Netsuite rest api.

Error while accessing a resource. You must have at least one valid line item for this transaction.

The sales order needs to be fulfilled with an item that is available in another subsidiary. This can be done in UI but I have not been able to achieve that using the rest call as described from the following help site: https://docs.oracle.com/en/cloud/saas/netsuite/ns-online-help/section_161425629582.html

The following is the JSON I am using:

    {
    "item": {
        "items": [
            {
                "orderLine": 1,
                "quantity": 1,
                "itemReceive": true,
                "location": {
                    "id": "239"
                },
                "inventoryDetail": {
                    "inventoryassignment": {
                        "items": [
                            {
                                "issueInventoryNumber": {
                                    "refName": "1D3B62A4000070"
                                },
                                "quantity": 1.0
                            }
                        ]
                    },
                    "quantity": 1.0,
                    "totalResults": 1
                },
                "shipGroup" : 1,
                "subsidiary": {
                    "id": "1"
                }
            }
        ]
    },
    "subsidiary": {
        "id": "1"
    },
    "location": {
        "id": "239"
    }
}

The location 239 belongs in subsidiary 1 while the order is placed in subsidiary 3.

Is it possible to use Netsuite rest api to fulfill orders with items from another subsidiary (cross-subsidiary fulfillment)? If yes, what am I missing?

I followed up with Netsuite support and they confirmed that cross-subsidiary fulfillment is not currently supported via Netsuite REST web services. The workaround is to build a restlet which then can be called to do cross-sub fulfillment.