Field 'customfield_10399' cannot be set. It is not on the appropriate screen, or unknown.

[Tu Pham]

I use the REST API to create Jira tickets.

Previously it worked well (I did create the issue including this custom field with REST API successfully), but the error 

Field 'customfield_10399' cannot be set. It is not on the appropriate screen, or unknown.

suddenly happens recently, don't really know why.

I did check:

- When I create the Jira ticket manually, the field is there on the issue layout.

- When I call the rest API to GET the issues' info, the custom field (customfield_10399) is returned in the JSON result.

- When I use the rest API to GET all the fields of the workspace, the custom field customfield_10399 is also returned in the custom fields list. (the URL is https:/MY_WORKSPACE/rest/api/2/field/)

I'm thinking the configuration of the project might be the cause but cannot find the info anywhere else. Thank you for your support.

[Niranjan]

Hi @Tu Pham ,

What is the field type of customfield_10399? What is the value that you are trying to set to the field? 

[Tu Pham]

Hi @Niranjan

The field type is string, I tried to post something like this 

'fields':{
 'project': {'key': project_key},
 'summary': summary,
 'description': description,
 'issuetype': {'name': issuetype_name},
 'priority': {'id': priority_id},
 'customfield_10399': 'this_is_a_string'
}

(without the customfield_10399, the request is successful.)

[Niranjan]

Hi @Tu Pham ,

Can you try with this?

"fields" : {

"project": {"key": project_key},
"summary": summary,
"description": description,
"issuetype": {"name": issuetype_name},
"priority": {"id": priority_id},
"customfield_10399" :
{"value" : "this_is_a_string"}
}

If the above doesn't work, just try with this "customfield_10399": "this_is_a_string"