400 Bad request while calling creating Quote in SOM

[RavinderK]

Hi All,

I am getting 400 bad request while trying to create Quote as per Quote Management Open API is a ServiceNow implementation of the TM Forum Quote Management API REST specification.  I tried multiple way with basic and mandatory fields only but getting this error.

Below is the sample JSON:

{

  "description": "B2B - First Test Quote for Home Tech Hub Bundle",

  "quoteDate": "2025-09-15 12:00:00",

  "validFor": {

    "startDateTime": "2025-09-15 12:00:00",

    "endDateTime": "2025-12-31 23:59:59"

  },

  "state": "Draft",

  "quoteItem": [

{

      "id": "item1",

      "action": "add",

  "@type": "QuoteItem",

  "state": "Draft",

  "product": {},

  "productOffering": {

        "id": "de901aec83f32610eadbf7efeeaad31b",

        "name": "SRK1004ETR",

        "@type": "ProductOfferingRef"

      },

      "quantity": 20,

      "unitOfMeasure": "Each",

  "price": {

        "priceType": "OneTime",

        "unit": "USD",

        "taxIncludedAmount": 700.00

      }

    }

  ],

  "relatedParty": [

    {

      "role": "Customer",

      "id": "75e55b7083f7a610eadbf7efeeaad3b5",

      "name": "Bosch China",

      "@type": "RelatedPartyRef",

      "@referredType": "Organization"

    }

  ]

}

Error: 

{
  "code": 21,
  "reason": "Invalid payload: Request body missing",
  "message": "Invalid payload: Request body missing",
  "details": [
    {
      "message": "A mandatory child product offering is missing for the parent product offering",
      "datapath": "/quoteItem[0]/productOffering"
    }
  ]
}

Thanks