Create Shipment Package Details in Acumatica

gistfile1.txt

PUT /entity/Tote/18.200.001/Shipment HTTP/1.1
Host: YourERPInstance
Content-Type: application/json
{
    "id": "a14bb7b0-28c2-ea11-8a94-0c54152a4c79",
    "Packages": [
        {
            "id": "a3a541c4-30c2-ea11-8a94-0c54152a4c79",
            "Contents": [
                {
                    "ShipmentSplitLineNbr": {
                        "value": "5"
                    }
                },
                {
                    "ShipmentSplitLineNbr": {
                        "value": "6"
                    }
                }
            ]
        }
    ]
}