Automate a locked dropdown field

[Kasper Ramstafer]

I'm trying to create an automation rule where when the custom dropdown field "Sprint" is updated the locked dropdown field "Current" will update it's value.  I created an If/else statement of if the first selection in the dropdown field "Sprint" is picked, then the first selection in the locked dropdown field "Current" will update its value to its first option. And so on with the options 2, 3, 4 etc. But I'm having issues with the "Current" field selecting the values.  I'm typically getting the error "Error while parsing additional fields. Not valid JSON."

In the additional fields sections I've tried both of these codes:

{
"fields": {
"Current": "{{triggerissue.fields.Current.Option1)}}"
}
}

{
"fields": {
"Current" = "Option1"
}
}

[JM Perrot · Accepted solution]

Hey @Kasper Ramstafer 

If you want I can share you a correct syntax 

{

   "fields": {

      "customfield_XXX": [{

         "value": "Your option in words or your smart value"

      }]

   }

}

[Kasper Ramstafer]

Thanks for your assistance!  I figured out the issue.  The locked field I was trying to use is from a plugin and isn't compatible with Jira automation.  Even after using your correct code it didn't work so I had to do more digging.