Netsuite rest api transform SO to item Fulfillment

I keep having this error message for a long while which drive me super crazy right now. Does anyone has ideas how to get rid of it?
Error Message: “Error while accessing a resource. You must have at least one valid line item for this transaction”
Code:
response1 = self.client_controller.post(url=’https://XXXXXX.suitetalk.api.netsuite.com/services/rest/record/v1/salesOrder/{XXXX}/!transform/itemFulfillment’, headers=self.headers, data=json.dumps(item_fullfil_obj))

    item_fullfil_obj = {
        "createdDate":"2024-06-05",
        "createdFrom":{
            "id":"5325997"
        },
        "custbody_bv_employee":{
            "id":"5188"
        },
        "customForm":{
            "id":"183" 
        },
        "department": {
            "id":"1"
        },
        "entity":{
            "id":"318"
        },
        "exchangeRate":1.0,
        "location":{
            "id":"609"
        },
        "shipstatus":"C",
        "status":"C",
        "tranDate":"2024-06-03",
        "subsidiary":{
            "id":"2"
        },
        "item":{
            "items": [
                {
                    "class":{
                        "id":"43"
                    },
                    "department":{
                        "id":"1"
                    },
                    "excludeFromRateRequest":False,
                    "inventoryDetail":{
                        "inventoryAssignment":{
                            "items":[
                                {
                                    "internalId":2820203,
                                    "inventoryDetail":2821220,
                                    "inventoryStatus":{
                                        "id":"1"
                                    },
                                    "quantity":1.0,
                                    "quantityAvailable":334.0
                                }
                            ]
                        },
                        "item":{
                            "id":"2525"
                        },
                        "quantity":1.0,
                        "location":{
                            "id": "609"
                        },
                        "toLocation": {
                            "id":"-1"
                        },
                        "unit":"1"
                    },
                    "item":{
                        "id":"2525"
                    },
                    "itemFxAmount":29.9,
                    "itemName":"BV-BA1",
                    "itemReceive":True,
                    "itemType":"InvtPart",
                    "itemUnitPrice":29.9,
                    "itemUpc":"813076020380",
                    "line":0,
                    "location":{
                        "id":"609"
                    },
                    "orderLine":4,
                    "quantity":1.0,
                    "quantityRemaining":1.0,
                    "quantityRemainingDisplay":1.0,
                    "units":"1",
                    "unitsDisplay":"PC"

                }
            ]
        },
        "orderId":5325997,
        "orderType":"SalesOrd",
        "package":{
            "items":[{
                "packageWeight":4.0
            }]
        },
        "tranDate":"2024-06-05"
    }

highly appreciated

also tried { “item”:{ “items”:[ { “orderLine”:1, “location”:609, “itemreceive”: true } ] }}, it returned the same error.