Updating single select custom field with automation for Jira

[Nikki Zavadska _Appfire_]

Hi 👋 ,

I'm trying to create automation that updates the custom field that I created with an option from that custom field.

The JSON I'm using to update is:

{
"fields": {
"customfield_10121": { "value": "b" }
},
}

(I figured this based on the documentation here: https://support.atlassian.com/cloud-automation/docs/advanced-field-editing-using-json/ 

This is how my custom field values look like in the GET issue api:

The values that are available in the dropdown for this field are a and b

When I run the automation I get the following error:

Error while parsing additional fields. Not valid JSON.

I can't see what I'm doing wrong here, I tried many options already but can't figure it out. Did anyone have a similar problem and find a solution?

[Nic Brough -Adaptavist-]

The REST API doesn't have that function in 7.4.3 and below, you'll need to do it by hand (or upgrade to a version that has it)