ServiceOder Open API throw error while using external ID

[Mythili Searn]

I am using Service Order Open API to create service order. I am using the example payload given in servicenow document. I have just removed the sys_id and updated them with external ID. External ID for Service Specification, Place, Account and Contact. But I get error for Account and Place. After providing sys_id for these 2, order is getting created. Only service specification and Contact is getting mapped with external id. 

How to override the Account and Place validation/mapping? Anybody done custom fields for mapping additional parameters, which are not in the example?

Below is error message I get while using external ID. 

{
  "code": 23,
  "reason": "Missing body field",
  "message": "Missing body field",
  "details": [
    {
      "message": "Invalid payload: Customer Account does not exist",
      "datapath": "/relatedParty[1]/"
    },
    {
      "message": "Invalid payload: The place doesn't exist in the system",
      "location": "serviceOrderItem[0]:200south"
    }
  ]
}

[cnharris1]

Thank you @Kailash Bhange !

I was able to write some code in to automatically create the account if it doesn't already exist in the platform.

Best regards,

cnharris1