OpenAPILineItem

{
    "description": "string",
    "discount": {
        "amount": 0,
        "reason": "string",
        "reasonCode": "string"
    },
    "lineId": 0,
    "productCode": "string",
    "productName": "string",
    "quantity": 0,
    "unit": "string",
    "unitPrice": 0,
    "vatTypeCode": "VAT",
    "whtRate": 0
}