Error when using editing issue fields with a Forge Custom field (Automation rule)

[Ben Greene]

I was looking into setting a default value for a custom field, specifically a forge custom field, but it seems that isn't possible atm: https://community.developer.atlassian.com/t/forge-custom-field-cant-edit-default-value-by-rest-api-3-field-fieldid-context-defaultvalue-api/54937

As a next best solution, I was hoping to be able to edit the value via an automation rule based on the Request Type. 

I had a go using the edit issue fields action, and as the forge custom field doesnt show up in the drop down, I tried the additional fields section using this:

{
"fields": {
"Issue Type MultiLevel": "Back Office"
}
}

My audit log returned this error:

Error editing issues (The value must be a JSON object. (customfield_10178)).

I imagine I need to tweak the line where I am setting the value, any ideas on specifically what to change?

[Gokaraju gopi]

@Ben Greene 

What do you mean by forge custom field? Is it a drop down field or multi cascading field ?

[Ben Greene]

Multi cascading field

[Gokaraju gopi]

@Ben Greene 

If you have two level then following should help you. (test1 and test2 are just example names you can replace them with your option names)

{
  "fields": {
    "customfield_10178": { "value": "test1", "child": { "value" : "test2"} }
  }

}

If its only one level then you can remove child

{
  "fields": {
    "customfield_10178": { "value": "test1" }
  }

}