SalesOrdersForOrderHub - adding project details | causing failure to update the SO

Summary:

REST API to update the project details is failing with 400 bad request.

Postman response showing "Unexpected 'S'"

Sample payload used:

{

  "projectDetail" : [ {

      "projectId": "300000019084239",

      "projectId_Display": "3000548",

      "taskId": "100000091209039",

      "taskId_Display": "HA",

      "expenditureItemDate": "2022-12-16",

      "expenditureTypeId": "300000005213836",

      "expenditureTypeId_Display": "Materialgoods",

      "organizationId": "300000003971044",

      "organizationId_Display": "500 indirect variable"

 } ]

}

Content (required):

The error response is not giving much of information on why it is failing.

Version (include the version you are using, if applicable):

/fscmRestApi/resources/11.13.18.05/salesOrdersForOrderHub/GPR%3A8018b0000017B8GAAU/child/lines/00020000000EACED00057708000110D9331519F00000000EACED00057708000110D9331519EF/child/project

Code Snippet (add any code snippets that support your topic, if applicable):