How to set a subtask assignee from a custom people field?

[Theo Furrow]

We use subtasks to track actions for multiple users in one issue. In this case, we have Business Analysts (BA) and Developers include on the issues as custom People fields. I am trying to use Automation to set the assignee of subtasks to either the BA or the Developer. 

I have been able to get select the specific subtask of those we list to have a person assigned, but I am not having success at setting the assignee based on the person entered in to the BA people filed on the parent issue. 

In the audit log I am getting this message:  Error editing issues:  BIZ-7474 (Specify a valid value for assignee (assignee))

Can someone advise on the verbiage I need to be using to get the ID from the BA people field to be set as the assignee for the subtask? 

[Bill Sheboy · Accepted solution]

Hi @Theo Furrow 

Based on your rule structure, I recommend referencing the trigger issue as the source for the parent.  Perhaps with this:

{{triggerIssue.customfield_10052.accountId}}

Please note you could also type in/paste that field for the assign field, without the need for the JSON edit.  To do so, just type/paste the smart value and it will appear below the field in Issue Edit, then you may select it for use.

Kind regards,
Bill

[Theo Furrow]

Thank you very much. That worked great.