Rest Api for creating an Contract

Rest API for Creating contract "/fscmRestApi/resources/11.13.18.05/contracts/{ContractId}/child/ContractLine" is throwing error while calling from Postman.

Request Payload:

{

"LineNumber": "1",

"LineTypeId": 300000000294521,

"LineTypeName": "Product",

"ItemNameTxt": "04000009",

"ItemDescription": "Testing",

"AgreedQuantity": 100,

"AgreedAmount": 10000

}

Error: You must enter an item for the line name because the line type requires an item. (OKC-195496)