How to set Request Type when editing or transition an issue via REST API

[Александр]

Hello!

I am trying to edit request type via JIRA REST API and I get a 500 Internal Server Error.

But if I try to create an issue, everything will be ok and the issue will appear with the required request type.

in my case, it is "customfield_17801" 

Сustom Field Option:

"customfield_17801": {
    "required": false,
    "schema": {
        "type": "sd-customerrequesttype",
        "custom": "com.atlassian.servicedesk:vp-origin",
        "customId": 17801
    },
    "name": "Тип запроса клиента",
    "fieldId": "customfield_17801",
    "operations": [
        "set"
    ]
}

To create an issue, the following code works for me:
POST https://mydomain.com/rest/api/2/issue

{
    "fields": {
        "summary": "test",
        "description": "test",
        "project": {
            "key": "HD"
        },
        "reporter": {
            "name": "Reropter@domain.com"
        },
        "customfield_17801": "hd/64d1aba4-bb35-49c2-80a8-c98fa9744804"
    }
}

But as soon as this is not created an issue, but something else
let's say editing or transition, Jira returns me a 500 error

edit example:

PUT https://mydomain.com/rest/api/2/issue/HD-123456

{    
   "fields":  {
      "customfield_17801":"hd/64d1aba4-bb35-49c2-80a8-c98fa9744804"
   }
}

and a transition example:

POST https://mydomain.com/rest/api/2/issue/HD-123456/transitions?expand=transitions.fields

{    

    "fields":  {        

        "customfield_17801": "hd/64d1aba4-bb35-49c2-80a8-c98fa9744804"

    },    

    "transition":  {
        "id":  "761"
    }

}

If I remove customfield_17801 from the request and try to edit any other field, the request will be successful.

I spent a lot of time looking for a solution, but I never found it. The only thing I could find was this task with a similar problem.
https://ecosystem.atlassian.net/browse/JSDECO-36

I am beginning to suspect that this field cannot be edited with API.

Please any help

[Markus]

From using Jira for automation, when you try to edit the Request Type it has a notification that there is no API for editing the request type.

[adham mhaydat]

Hi @Markus 
How can i fill the Customer Request Type field by using the create issue API