Dynamics 365 API v2: Adding sales lines to an existing sales order

I am trying to add sales lines to an existing sales order using the standard API included with dynamics 365 business central. However I cannot find the correct syntax on the api request to accomplish this.

I have tried posting to the companies({id})/salesOrderLines endpoint, and the companies({id})/salesOrder({id})/salesOrderLines endpoint but no matter how I try to work my request I always get the "Invalid Request Body" error.

Here is an example of the request I sent to the companies({id})/salesOrderLines endpoint:

Here is my request body:

[
  {
    "id": "e92c39cb-f552-4d4f-b680-ad7ded2949d0",
    "documentId": "e80573b0-9c8b-ed11-bfba-001dd8b71ee3",
    "lineType": "Item",
    "lineObjectNumber": "H10-110013",
    "quantity": 1
  },
  {
    "id": "e92c39cb-f552-4d4f-b680-ad7ded2949d0",
    "documentId": "e80573b0-9c8b-ed11-bfba-001dd8b71ee3",
    "lineType": "Item",
    "lineObjectNumber": "H10-112117",
    "quantity": 1
  }
]

Here is the response I get back:

"{"error":{"code":"BadRequest","message":"Invalid Request Body CorrelationId: 241e540a-5af5-4516-83f2-fbc035f80389."}}"

I am able to post a sales order and its lines simultaneously using deep requests but with larger orders they hit the request limit and I need a way of splitting up the lines.

salesOrderLines endpoint expects an object and does not accept collections, so best you can do here is post each line in a separate request. Request body would look like this:

{
    "lineType": "Item",
    "lineObjectNumber": "H10-110013",
    "quantity": 1
}

id and documentId can be added to the request, but not really required.

Another option is to send the request on the $batch endpoint as described in the docs here: https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/webservices/use-odata-batch

POST http://bc21-dev:7048/bc/api/v2.0/$batch

{
    "requests": [
        {
            "method": "POST",
            "url": "http://bc21-dev:7048/bc/api/v2.0/salesOrders(dd3585b3-dd6c-ed11-81b4-6045bd8e5172)/salesOrderLines",
            "headers": {
                "Company": "CRONUS International Ltd.",
                "Content-Type": "application/json"
            },
            "body": {
                "lineType": "Item",
                "lineObjectNumber": "1920-S",
                "quantity": 2,
                "unitPrice": 420.4
            }
        },
        {
            "method": "POST",
            "url": "http://bc21-dev:7048/bc/api/v2.0/salesOrders(dd3585b3-dd6c-ed11-81b4-6045bd8e5172)/salesOrderLines",
            "headers": {
                "Company": "CRONUS International Ltd.",
                "Content-Type": "application/json"
            },
            "body": {
                "lineType": "Item",
                "lineObjectNumber": "1952-W",
                "quantity": 1,
                "unitPrice": 183.12
            }
        }
    ]
}