Versandetikett-Abrufe enden in einem 422 Unprocessable Entity

Antwort: "422: Unprocessable Entity"
zu POST Anfrage an "shipping/shipments"

Inhalt der Antwort: 
{
    "error": {
        "title": "RequestBodyValidationError",
        "message": "Provided data is invalid",
        "status": 422,
        "developerMessage": [
            {
                "message": "should be >= 0",
                "params": {
                    "comparison": ">=",
                    "limit": 0,
                    "exclusive": false
                },
                "target": ".package.freightCharges"
            }
        ]
    }