Sales Order Assistant not selecting Order Type

Summary:

Provided Sales Order Assistant template is working for order creation worked initially but without adding order type, While modifying payload to include transactiontype for resource path

/fscmRestApi/resources/11.13.18.05/omSalesOrders , Agent is throwing error

As I cannot find any documentation for this endpoint, Can we modify the Payload for this non public endpoint to include transaction type?

Content (please ensure you mask any confidential information):

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

25D

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

Output{ "response": { "title": "Bad Request", "status": 400, "o:errorDetails": [ { "detail": "TransactionType cannot be updated.", "o:errorCode": 27008, "o:errorPath": "/TransactionType" } ] }, "responseStatus": 400}