Inserting 'Sales Order Line' record raised at least one error.

@chvakhil Did you post  to DEFAULT endpoint? I had problem when I post request to the DEFAULT endpoint. So I created a new endpoint and it works with very sample json content. 

{
    "Customer":{
        "value":"XXX"
    },
    "note": {
        "value": "Created by EDI/API.Fedex Account:xxx"
    },
    "ShipVia":{
        "value":"FEDEXGRD"
    },
    "Date":{
        "value":"2022-07-26T00:00:00.000Z"
    },
    "CustomerOrderNbr": {
        "value": "APIOrderTest3"
    },
    "PreferredWarehouseID":{
        "value":"XXX"
    },
    "ShipToAddress": {
        "AddressLine1": {
            "value": "Test Address override"
        },
        "AddressLine2":{
            "value":""
        },
        "City": {
            "value": "Edison"
        },
        "Country": {
            "value": "US"
        },
        "PostalCode": {
            "value": "08817"
        },
        "State": {
            "value": "NJ"
        }
    },
    "ShipToAddressOverride": {
        "value": true
    },
    "ShipToContact": {
        "Attention": {
            "value": "Customer Name"
        },
        "BusinessName": {
            "value": "Business Name"
        },
        "Email": {
            "value": "test@fake.com"
        },
        "Phone1": {
            "value": "xxxxxxx"
        }
    },
    "ShipToContactOverride": {
        "value": true
    },
    "Details":[
        {
            "InventoryID":{
                "value":"ITEM-14"
            },
            "OrderQty":{
                "value":1
            }
        }
    ]

}