400 Error Adding order via API

Receiving the below error when adding an order. Any help would be appriciated.

{
    "error_messages": {
        "order": {
            "line_items": [
                "can't be blank"
            ]
        }
    }
}

Json being sent below, I’ve used dummy values but actual request used real values:

{
    "channel_id":12345,
    "delivery_method_id":123456,
    "due_date":"17/07/2021",
    "number":"UK123456789",
    "send_notification_email":false,
    "total_discounts":0,
    "deliver_to_attributes":
    {
        "address1":"Address 1",
        "address2":"Address 2",
        "city":"City",
        "country":"GB",
        "customer_id":12345678,
        "first_name":"Test",
        "last_name":"Name",
        "state":"",
        "zip":"AB3 3CD"
    },
    "customer_id":12345678,
    "line_items_attributes": [
        {
            "sellable_id":12345678,
            "price_per_unit":"12.00",
            "quantity":"1"
        }
    ]
}

Hi @timatcg

Is this happening for all orders?

Can you send the full request including IDs to api-support@veeqo.com and I will pick it up from there.

Thanks,
Sam